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How bright is Bright?

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Road Cycling
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30 August 2005
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24 September 2005
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Chris Zacho The Wheelman
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  1. I was reading the latest Performance catalogue today and while looking
    at the various "super lights" I got to asking myself (since there was no
    one else available) "Why cant they rate the brightness of ALL headlights
    the same way?" This head light has [censored] watts, that one is YYY
    candlepower, and this one over here shines with a brightness on ZZZZ
    lumens.

    Now I'm sure there are scientific formulas to convert these various
    measurements, but the average Joe Cyclist is not likely to know them.
    Can't just settle on ONE standard measurement for all lights so we can
    make a decent comparison and get what we want?

    - -

    "May you have the winds at your back,
    And a really low gear for the hills!"

    Chris Zacho ~ "Your Friendly Neighborhood Wheelman"

    Chris'Z Corner
    http://www.geocities.com/czcorner

  2. In article <[email hidden]>,

    Chris Zacho 'The Wheelman said:

    Now I'm sure there are scientific formulas to convert these various
    measurements, but the average Joe Cyclist is not likely to know them.
    Can't just settle on ONE standard measurement for all lights so we can
    make a decent comparison and get what we want?

    You forget the primary purpose of advertising is to confuse the customer.
    If advertising actually educated the customer, then inferior products
    would cease to exist and inferior companies would go out of business.

  3. I agree. These figures are confusing. Each company probably has a
    reason why their system is the best at determining how "bright" a light
    is, but who knows how much of that is hype and how much of it is real.

    The market is also segmented into those who buy a light just to be seen
    (and comply with local bike ordinances) and those who want to actually
    see a significant portion of the road at night.

    Your best bet may be a trip to a LBS with a liberal exchange policy in
    case you're not satisfied.

  4. Chris Zacho The Wheelman said:

    I was reading the latest Performance catalogue today and while looking
    at the various "super lights" I got to asking myself (since there was no
    one else available) "Why cant they rate the brightness of ALL headlights
    the same way?" This head light has [censored] watts, that one is YYY
    candlepower, and this one over here shines with a brightness on ZZZZ
    lumens.

    Now I'm sure there are scientific formulas to convert these various
    measurements, but the average Joe Cyclist is not likely to know them.
    Can't just settle on ONE standard measurement for all lights so we can
    make a decent comparison and get what we want?

    Watts and lumens are really only useful when you are comparing lamps
    with similar optics. Candela measurements are widely abused because of
    the directional nature of the measurement, you would need to have
    multiple measurements at different points in order to make it
    meaningful. LED lamps are especially hard to quantify using watts or
    lumens, especially when there are multiple LEDs.

    There are so many other differences between various lamps, besides the
    brightness, that you really could not choose between various models
    based mainly on the brightess.

    You really need some test standards based on how well various items can
    be seen with different lights, and the items need to be placed both
    straight ahead, to each side, and down at the road. Often, people will
    look only at the road directly ahead of the bicycle when evaluating
    lights, but as Marty Goodman wrote (regarding the CatEye's Stadium
    Bicycle Light): "With vastly more light available, night bicycling is
    qualitatively far safer. The road can be lit both further ahead and,
    even more important, far more brightly to the sides of the bicycle."

  5. On Tue, 30 Aug 2005 17:07:09 -0400, [email hidden] (Chris

    Zacho 'The Wheelman') said:

    I was reading the latest Performance catalogue today and while looking
    at the various "super lights" I got to asking myself (since there was no
    one else available) "Why cant they rate the brightness of ALL headlights
    the same way?" This head light has [censored] watts, that one is YYY
    candlepower, and this one over here shines with a brightness on ZZZZ
    lumens.

    Now I'm sure there are scientific formulas to convert these various
    measurements, but the average Joe Cyclist is not likely to know them.


    '>Can't just settle on ONE standard measurement for all lights so we
    can

    Quoted message said:

    make a decent comparison and get what we want?

    - -

    "May you have the winds at your back,
    And a really low gear for the hills!"

    Chris Zacho ~ "Your Friendly Neighborhood Wheelman"

    Chris'Z Corner

    Too bad that we can't get Consumer Reports to do a feature study on
    bike lights.

    At least you have a buyer's safety net: if you buy one from
    Performance and you don't like it, for whatever reason, you can return
    it without any hassles, other than shipping it back, if you don't live
    near one of their stores. But it's still a headache to keep trying
    products that turn out to be B.S. or less than described.

    I haven't done it myself, but here's an idea. Sears sells their
    Craftsman drill "kits" from time to time for a hundred bucks. These
    are (mine is) 19 volt units that come with a charger and two
    batteries, AND a tall handheld 18 volt flashlight. These are bright
    and when duct-taped to a handlebar (as a trial experiment only) do a
    good job. You can get an extended warranty for about another twelve
    bucks. The salesman told me that since the replacement batteries are
    about a hundred bucks for both, IF they start to go bad at the end of
    the warranty period, which they often do, bring them in and get a new
    set. So for a little over a hundred bucks, you have great drill, two
    batteries that aren't very heavy to carry both for insurance, and a
    bright light that could be adapted to a handlebar. Cannot tell you the
    runtime on the battery because I drive only on rural roads, pull over
    when cars are coming, and use a Petzl Artic Zoom halogen headlamp. If
    I drove more after dark, I'd cut the head off the Craftsman light and
    use it. I have plenty of other flashlights.

    For taillights after dark, nothing beats a true Xenon strobe, runs on
    2 double A batteries for about four hours. LED blinkies are cute and
    bright, for what they are, but no match for the real thing:

    http://www.storesonline.com/site/440848/product/AllPSLK-XENONSTROBE

    I have red one for the rear, and a white one for the front. The white
    one can be seen well over a mile away, in fact, cannot be not-seen.

    Being hit is the worst imaginable. Sometimes, it's a drunk that you
    can't do much about, But not always, and I do anything I can to be
    blatantly visible to distracted drivers. Looking ridiculous is better
    than being hit, and I have little sympathy for cyclists who are dumb
    enough to not look at themselves from a driver's point of view. It's
    surprising how many cyclists dress as though they want to NOT be seen,
    and are doing a very good job of it. Maybe they don't want to look
    "uncool." Darwin Award contenders.

    Geezer Boy

  6. Chris Zacho The Wheelman said:

    I was reading the latest Performance catalogue today and while looking
    at the various "super lights" I got to asking myself (since there was no
    one else available) "Why cant they rate the brightness of ALL headlights
    the same way?" This head light has [censored] watts, that one is YYY
    candlepower, and this one over here shines with a brightness on ZZZZ
    lumens.

    Now I'm sure there are scientific formulas to convert these various
    measurements, but the average Joe Cyclist is not likely to know them.
    Can't just settle on ONE standard measurement for all lights so we can
    make a decent comparison and get what we want?

    One of the best conversion sites is www.onlineconversion.com and they
    don't have a simple conversion, probably because of multiple factors
    involved, for example 3w is a useless figure unless you also know the
    voltage and lamp type. Converting between Candlepower and lumens, can
    be found at:

    http://www.madsci.org/posts/archives/apr2001/987003940.Ph.r.html

    Unless you have a math or physics degree, the actual formulas are a
    little heavy......

    W

  7. On Tue, 30 Aug 2005 20:18:58 -0400, Geezer Boy <[email hidden]>

    Quoted message said:


    For taillights after dark, nothing beats a true Xenon strobe, runs on
    2 double A batteries for about four hours. LED blinkies are cute and
    bright, for what they are, but no match for the real thing:

    http://www.storesonline.com/site/440848/product/AllPSLK-XENONSTROBE

    I have red one for the rear, and a white one for the front. The white
    one can be seen well over a mile away, in fact, cannot be not-seen.

    Being hit is the worst imaginable. Sometimes, it's a drunk that you
    can't do much about, But not always, and I do anything I can to be
    blatantly visible to distracted drivers. Looking ridiculous is better
    than being hit, and I have little sympathy for cyclists who are dumb
    enough to not look at themselves from a driver's point of view. It's
    surprising how many cyclists dress as though they want to NOT be seen,
    and are doing a very good job of it. Maybe they don't want to look
    "uncool." Darwin Award contenders.

    Geezer Boy


    Looks good but two questions. Will it work with rechargeables? Is
    there an attachment that will clip onto the back of a pack? My pack
    tends to obscure the back of the seat so it would need to clip onto
    that 1 inch band that my LED blinkie attaches to.

  8. dgk said:

    On Tue, 30 Aug 2005 20:18:58 -0400, Geezer Boy <[email hidden]>

    Quoted message said:


    For taillights after dark, nothing beats a true Xenon strobe, runs on
    2 double A batteries for about four hours. LED blinkies are cute and
    bright, for what they are, but no match for the real thing:

    http://www.storesonline.com/site/440848/product/AllPSLK-XENONSTROBE

    I have red one for the rear, and a white one for the front. The white
    one can be seen well over a mile away, in fact, cannot be not-seen.

    Being hit is the worst imaginable. Sometimes, it's a drunk that you
    can't do much about, But not always, and I do anything I can to be
    blatantly visible to distracted drivers. Looking ridiculous is better
    than being hit, and I have little sympathy for cyclists who are dumb
    enough to not look at themselves from a driver's point of view. It's
    surprising how many cyclists dress as though they want to NOT be seen,
    and are doing a very good job of it. Maybe they don't want to look
    "uncool." Darwin Award contenders.

    Geezer Boy


    Looks good but two questions. Will it work with rechargeables?

    1. Yes, Nimh AAs. But with shorter runtimes probably -- I just tried
    them to make sure. Personally, these strobes are the one item I use
    standard alkalines in, even though I have about three dozen Nimh
    rechargeables, that I use for flashlights, radios, book light, camera,
    and camera strobes. I buy a brick of AAs at Costco and keep them for
    emergencies and for the bike strobes. If I did a lot of night riding,
    I could switch over to the rechargeables, but even then the alkalines
    are a small expense, and I am not poor. If I were a struggling
    student, I might switch. But I want full and lengthy output on these
    things as my life depends upon them, like brake pads.

    The only negative to these strobes (they *are* a quality item) is that
    one of the battery end clip holders can pop loose when you remove a
    battery. The batteries are held in quite snugly. It's no big deal and
    the piece snaps right back but it's a piece of black plastic about
    the size of your fingernail, so don't lose it.

    Quoted message said:

    Is there an attachment that will clip onto the back of a pack? My pack
    tends to obscure the back of the seat so it would need to clip onto
    that 1 inch band that my LED blinkie attaches to.

    2. Yes, it comes with a plastic spring clip, a suction cup, and a
    bracket for a wide belt to go through. Very thorough provisions for
    attachment. The clip is rather large, made for a wider and thicker
    belt, so may tend to flop on a band that narrow, if the band isn't
    tight against the pack. But you can figure out a way to remedy that,
    such as wide velcro. A more efficient way that I do is to use a wide
    "bike trouser strap" on m yleft ankle, and then I get an up and down
    motion of the flashings. Only the total blind can miss it then. They
    may also offer a bike kit, if I recall correctly. They do supply them
    for bike cops, but I'm not sure if they include attachments for the
    rear as well as the bar mounts.

    The ultimate, of course, is to order two lights for the rear, one red
    and one blue, and set them on your back. At least a quarter mile away,
    people will assume it's a cop, and definitely slow down. Of course
    when a real cop comes along, he may have "issues" and cite you. I have
    no idea what the fine would be, but if anyone knows and it isn't too
    much, I would risk it if I had to ride in a hazardous area after dark.
    BTW, I believe you can order extra colored lenses for these, so you
    could do this experiment at low cost.

    Geezer Boy

  9. (Geezer Boy) said:

    LED blinkies are cute and bright, for
    what they are, but no match for the real
    thing:
    http://www.storesonline.com/site/440848/product/AllPSLK-XENONSTROBE
    I have red one for the rear, and a white
    one for the front. The white one can be
    seen well over a mile away, in fact,
    cannot be not-seen.

    I like those. I used to have a white xenon flasher (CatEye, I think) on
    the front of my bike as a back up to the main headlight. But it isn't
    made any more.

    I will save this site, thanks.

    - -

    "May you have the winds at your back,
    And a really low gear for the hills!"

    Chris Zacho ~ "Your Friendly Neighborhood Wheelman"

    Chris'Z Corner
    http://www.geocities.com/czcorner

  10. (Geezer Boy) said:

    The ultimate, of course, is to order two
    lights for the rear, one red and one blue,
    and set them on your back. At least a
    quarter mile away, people will assume
    it's a cop, and definitely slow down. Of
    course when a real cop comes along, he
    may have "issues" and cite you. I have
    no idea what the fine would be, but if
    anyone knows and it isn't too much, I
    would risk it if I had to ride in a
    hazardous area after dark. BTW, I
    believe you can order extra colored
    lenses for these, so you could do this
    experiment at low cost.

    Quoted message said:

    Geezer Boy

    Good question, just how many times have we noticed, usually out of the
    corner of our eye, a motorcyclist (and/or their bike) dressed up to
    resemble a cop's cycle? Or at least resemble one close enough to warrant
    our complete attention when seen out of the aforementioned eye corner?

    Technically you are not really impersonating as an officer JUST by using
    a couple of lights And getting yourself safely seen and not run over can
    be an effective argument in court...

    - -

    "May you have the winds at your back,
    And a really low gear for the hills!"

    Chris Zacho ~ "Your Friendly Neighborhood Wheelman"

    Chris'Z Corner
    http://www.geocities.com/czcorner

  11. Geezer Boy said:


    For taillights after dark, nothing beats a true Xenon strobe, runs on
    2 double A batteries for about four hours. LED blinkies are cute and
    bright, for what they are, but no match for the real thing:

    http://www.storesonline.com/site/440848/product/AllPSLK-XENONSTROBE

    I have red one for the rear, and a white one for the front. The white
    one can be seen well over a mile away, in fact, cannot be not-seen.

    Being hit is the worst imaginable. Sometimes, it's a drunk that you
    can't do much about, But not always, and I do anything I can to be
    blatantly visible to distracted drivers.

    Out of curiosity, have you actually been hit while riding with legal
    lights at night? Do you know many people who have?

    I've been a regular night rider and frequent night commuter since 1977,
    and I've done perfectly fine with "normal" lights and reflective
    devices. My friends who ride for transportation report the same. In
    fact, I'm pretty sure I'm spotted better at night than in the daylight.

    Quoted message said:

    Looking ridiculous is better
    than being hit, and I have little sympathy for cyclists who are dumb
    enough to not look at themselves from a driver's point of view.

    Looking at one's self from a driver's point of view is very good
    advice! As I've described many times, I've run night riding workshops
    for my club on several occasions, where members got to observe their
    bikes and lights from a car as another member rode their bike.

    The most common reaction has been "Oh, my bike is actually _very_
    visible." That's with normal lights & reflectors. We've never had
    anyone say "I can see I need a xenon strobe."

    Personally, I've gotten spontaneous compliments from several drivers on
    the visibility of my bike. That's with a generator set, a front & rear
    LED blinky, and reflectors. Based on the above, I don't think one
    needs much overkill.

    - Frank Krygowski

  12. In article <[email hidden]>,

    Quoted message said:

    Personally, I've gotten spontaneous compliments from several drivers on
    the visibility of my bike. That's with a generator set, a front & rear
    LED blinky, and reflectors. Based on the above, I don't think one
    needs much overkill.

    I've gotten similar compliments myself, with my similar
    lighting config. I suspect the drivers appreciate that
    I've got lights at all, considering the number of unlit
    riders at night around here.

    cheers,
    Tom

    --
    -- Nothing is safe from me.
    Above address is just a spam midden.
    I'm really at: tkeats [curlicue] vcn [point] bc [point] ca

  13. Quoted message said:


    Geezer Boy said:


    For taillights after dark, nothing beats a true Xenon strobe, runs on
    2 double A batteries for about four hours. LED blinkies are cute and
    bright, for what they are, but no match for the real thing:

    http://www.storesonline.com/site/440848/product/AllPSLK-XENONSTROBE

    I have red one for the rear, and a white one for the front. The white
    one can be seen well over a mile away, in fact, cannot be not-seen.

    Being hit is the worst imaginable. Sometimes, it's a drunk that you
    can't do much about, But not always, and I do anything I can to be
    blatantly visible to distracted drivers.


    Quoted message said:

    Out of curiosity, have you actually been hit while riding with legal
    lights at night? Do you know many people who have?

    No, I've never been hit. Dogs in daylight are my usual problem. But
    sinced I found a small squirter of CS gas, they don't come after me a
    second time. I don't live in town. At night where I am, it's usually
    only the occasional guy in a pickup truck, often with a Busch in his
    hand, and not his first one of the evening. I have to pick up their
    empties along my roadsides every month. During the peak of Summer, the
    "summer folks" with boats on trailers are more plentiful. They also
    are often rosy-complected. In autumn, it's more pickups out there
    jacklighting deer, again often with the help of a twelve-pack.

    Quoted message said:


    I've been a regular night rider and frequent night commuter since 1977,
    and I've done perfectly fine with "normal" lights and reflective
    devices. My friends who ride for transportation report the same. In
    fact, I'm pretty sure I'm spotted better at night than in the daylight.

    Quoted message said:

    Looking ridiculous is better
    than being hit, and I have little sympathy for cyclists who are dumb
    enough to not look at themselves from a driver's point of view.

    Looking at one's self from a driver's point of view is very good
    advice! As I've described many times, I've run night riding workshops
    for my club on several occasions, where members got to observe their
    bikes and lights from a car as another member rode their bike.

    The most common reaction has been "Oh, my bike is actually _very_
    visible." That's with normal lights & reflectors. We've never had
    anyone say "I can see I need a xenon strobe."

    If it works for someone, that's great. In my situation, since it's
    cheap and available, why turn it down? I don't generally restrict
    myself to needs. In fact, if the bike could light up light a
    fluorescent tube, it would be more visible and improve my chances even
    more. Obviously this attitude can go over the line into irrational
    paranoia, but I don't think two flashing strobe lights go that far.

    I don't have the statistics on how many people are hit at night, but
    when I am in town after dark, I see those cyclists who have lights
    front and rear, and reflectors, legal all right, but they are not very
    visible at all. I have yet to see one that has adequate lighting *to
    me* as a driver. Reflectors that are oriented toward the rear or side
    are more noticeable than most lights, but only when I am near the
    cyclists, most of the time. I notice cell phone distractions, lighting
    cigarettes -- both are big activities here, and the law against cell
    phone conversations hasn't made any difference, from what I observe.
    Cyclists are not expected at night in this locale and this also makes
    them more difficult to get noticed, perhaps.

    When I was in Florida, Ft. Lauderdale to be exact, last February, I
    had to ride quite a ways from the beach to my brother's where I was
    staying, after dark. This was mostly in traffic but with some sidewalk
    riding also when I could. I didn't have the strobes but wished I had.
    Next year I will. I could see why Florida supposedly has the highest
    number of pedestrians hit per capita of anywhere. I used to ride in DC
    for decades, so am not afraid of traffic, but it was not pleasant and
    drivers are more agressive today, in my observation.

    Quoted message said:


    Personally, I've gotten spontaneous compliments from several drivers on
    the visibility of my bike. That's with a generator set, a front & rear
    LED blinky, and reflectors. Based on the above, I don't think one
    needs much overkill.

    - Frank Krygowski

    The blinkies and reflectors are good, and work for many I am sure. I
    just like the extra insurance because as I say, I live in a hillyhh
    rural area, and am probably the only bicyclist on the road within five
    miles, after dark. There are many motorclists, but drivers are not
    expecting slow-moving bikes; rarity is understating the matter, and
    there are so many rolling hills and crests that blinkies aren't
    visible enough far enough back to do me any good. Once summer is over,
    I am often the only cyclist I see in the daytime. People are used to
    going 55 mph (legal) on these narrow two-lane roads, and many do 70.
    Yes, visibility from way back is important to me, overkill as you say.
    I think of it as cheap insurance.

    Ken Kifer was killed by an intoxicated driver, in the early evening as
    I recall, Cannot say more about his situation, but It may be likely
    that there are other instances where visibility overkill might have
    prevented a roadkill. Do what's best for your particular situation.
    I'm glad you've found what works for you. Happy riding.

    G.B.

  14. Geezer Boy said:

    For taillights after dark, nothing beats a true Xenon strobe, runs on
    2 double A batteries for about four hours. LED blinkies are cute and
    bright, for what they are, but no match for the real thing:

    http://www.storesonline.com/site/440848/product/AllPSLK-XENONSTROBE

    This is true, xenon strobes are, by far, the most visible rear lights.
    Night-Sun sells them as well.

    I bought a 12V xenon strobe from All Electronics
    ("http://www.allelectronics.com/cgi-bin/category.cgi?category=search&item=STROBE-3A&type=store"😉
    and hooked it up to my 12V lighting system.

    Now that there are some decent LED flashers available, i.e. the CatEye
    TL-DL1000, I see less of an advantage for a xenon strobe than before.
    The downsides of xenon strobes is that the bulb doesn't last as long as
    LEDs, and the power consumption is much higher.

  15. On Wed, 31 Aug 2005 20:39:11 -0400, [email hidden] (Chris

    Zacho 'The Wheelman') said:
    (Geezer Boy) said:

    The ultimate, of course, is to order two
    lights for the rear, one red and one blue,
    and set them on your back. At least a
    quarter mile away, people will assume
    it's a cop, and definitely slow down. Of
    course when a real cop comes along, he
    may have "issues" and cite you. I have
    no idea what the fine would be, but if
    anyone knows and it isn't too much, I
    would risk it if I had to ride in a
    hazardous area after dark. BTW, I
    believe you can order extra colored
    lenses for these, so you could do this
    experiment at low cost.

    Quoted message said:

    Geezer Boy

    Good question, just how many times have we noticed, usually out of the
    corner of our eye, a motorcyclist (and/or their bike) dressed up to
    resemble a cop's cycle? Or at least resemble one close enough to warrant
    our complete attention when seen out of the aforementioned eye corner?

    Technically you are not really impersonating as an officer JUST by using
    a couple of lights And getting yourself safely seen and not run over can
    be an effective argument in court...

    - -

    "May you have the winds at your back,
    And a really low gear for the hills!"

    Chris Zacho ~ "Your Friendly Neighborhood Wheelman"

    Chris'Z Corner
    http://www.geocities.com/czcorner

    There used to be a photo on the net at Don Ellis' site of a
    motorcyclist in Hong Kong, who had a Honda set up just like a cop's
    cycle. On the windshield in big letters it said "POLITE" and Don's
    photo showed two female officers looking at the parked bike pensively.
    It had outboard upper big running lights, and was a white motorcycle,
    an exact duplicate of a cop cycle except for the letter T instead of a
    C. Pretty cool, I thought.

    I wonder what the offense would be exactly, and the fine, for running
    flashing blue and red lights on your backpack while cycling? And the
    defense you mention should carry some weight in court -- the offense
    is hardly imprersonating an officer. OTOH with the lfascist mentality
    apparent is some circles today, it might be construed as such. I
    fondly remember when, many years ago, it was illegal in DC to have a
    flashing light on your bike. Messengers and others put them on their
    leg instead, as I do with my red strobe. I heard that they
    successfully won in court because the light was not on the bike, as
    the law stated, but on a person. That's what I did with mine back then
    and I was never stopped. They were amber lights with 9 volt battery. I
    still have it, a relic.

    I doubt you could successfully be charged today if you were a jogger
    or walker today, and wore flashing red and blue lights on your back or
    waist belt, maybe even adding a white one too, duplicating the
    appearance from a distance of a parked state police car (many states
    use all three colors, and it is quite intimidating).

    These strobes really do look cool from a distance when you put two of
    them next to each other, my red and white one.

    Geezer Boy

    "Kids, obey all laws" -- RoboCop

    "Obedience is freedom."

  16. I use a 12V homebrew lighting system (no rear light). The light
    housing is designed to spill light from the rear of the unit, which
    illuminates the rider nicely.

    For rear lights, I use a cheap red LED CatEye (2 x AAA). This is
    perfectly adequate for the trail riding I do. HOWEVER...

    On a recent evening (dusk) ride with my wife, I noticed that the CatEye
    was *horrible* in terms of visibility. From 5m back, I had difficulty
    even seeing that the light was on: a very narrow field of view combined
    with low power. I asked her to switch to "flash" mode which did
    improve visibility somewhat (but this may be illegal and apparently
    causes tracking issues for motorists). Either way, I recognize that
    this would be almost impossible to see as a motorist.

    I am now interested in improving my tail-lights. I still think I'll
    use the LED as a backup (simply clips to my helmet). The xenon strobe
    you mention is very interesting. I have some questions:

    1) How bright is this thing? (brighter than the CatEye LD1000?)
    2) This is a xenon strobe, so I assume that it flashes. What is the
    flash frequency?
    3) Can you set the light to be constantly on?
    4) How long do you get out of a set of batteries?

    Cheers,
    Dave

  17. In article <[email hidden]>,

    Quoted message said:

    I asked her to switch to "flash" mode which did
    improve visibility somewhat (but this may be illegal and apparently
    causes tracking issues for motorists).

    Whether it's legal depends on the jurisdiction. Here (Ontario, Canada)
    it's illegal to display a flashing red light on the road (ehrmm,
    "use a lamp [other than four-way flashers, which I'm used to seeing
    mostly in colors other than red anyways] that produces intermittent
    flashes of red light"😉 unless you're a school bus or an emergency or
    law enforcement vehicle. I've heard reports from elsewhere that a solid
    red is required but a blinky is an acceptable addition, and from still
    elsewhere that a blinkylight is allowed/expected as the only taillight.

    But tracking problems definitely show up. I find riding behind a blinky
    is Rather Annoying, since the flashing light keeps drawing my attention
    where a solid light lets me track it mostly-unconsciously in my peripheral
    vision once I've identified that there's something there and focus on
    other things that may need my attention. It's also harder to estimate
    distance and closing speed when all you have to go by is a blinky.

    dave

    --
    Dave Vandervies [email hidden]
    [W]hen I am among non-physician Ph.D.s who go by "Doctor" then I like
    to be called "Bachelor Petrofsky" in honor of my B.S..
    --Al Petrofsky in comp.lang.scheme

  18. Were the batteries OK? I used to think that LEDs were either on or off but
    in fact they do gradually go dim and it sometimes hard to notice this
    happening as it is so gradual.

    Seems likely that the law is about to change in the UK to make flashing
    legal.

    I know what you mean about "tracking" but IMHO the extra attention-grabbing
    effect of flashing far outways that problem.

    Quoted message said:

    On a recent evening (dusk) ride with my wife, I noticed that the CatEye
    was *horrible* in terms of visibility. From 5m back, I had difficulty
    even seeing that the light was on: a very narrow field of view combined
    with low power. I asked her to switch to "flash" mode which did
    improve visibility somewhat (but this may be illegal and apparently
    causes tracking issues for motorists). Either way, I recognize that
    this would be almost impossible to see as a motorist.

  19. In article <[email hidden]>,

    POHB said:

    I know what you mean about "tracking" but IMHO the extra attention-grabbing
    effect of flashing far outways that problem.

    No, the attention-grabbing effect IS PART OF the problem. You're not
    the only thing on the road the driver needs to be aware of.

    dave

    --
    Dave Vandervies [email hidden]
    If it'll help, I know a place where you can hire a big black mask, a cloak,
    and a sword that can make buzzy noises (batteries not included).
    --Richard Heathfield in comp.lang.c

  20. Quoted message said:


    For rear lights, I use a cheap red LED CatEye (2 x AAA). This is
    perfectly adequate for the trail riding I do. HOWEVER...

    On a recent evening (dusk) ride with my wife, I noticed that the CatEye
    was *horrible* in terms of visibility. From 5m back, I had difficulty
    even seeing that the light was on: a very narrow field of view combined
    with low power. I asked her to switch to "flash" mode which did
    improve visibility somewhat (but this may be illegal and apparently
    causes tracking issues for motorists). Either way, I recognize that
    this would be almost impossible to see as a motorist.

    There may be several things going on here. First, the tiniest LED
    blinkies, those running on AAA batteries, are certainly not as bright
    as those running the larger AA batteries. I'd consider one using AAs
    instead.

    Second: Yes, LED blinkies are very directional. Normally this is not a
    problem, since you really don't need light going up to the airplane
    pilots. But if the blinkie is not properly mounted, the bright beam
    may not be pointed where it needs to be. I've seen many people with
    blinkies dangling from clothing, backpacks or bike bags, shining
    diligently at the ground or off to the side. Make sure the blinkie is
    rigidly mounted and facing straight back.

    Third, if you were close behind on a bike, your line of sight is higher
    than a motorist's line of sight. It's possible that it actually looks
    better to a motorist. You can check this out easily enough, of course.

    All in all, I'll point out that 2xAA LED blinkies work extremely well.
    They've become the standard bike taillight for just that reason. Their
    visibility has been confirmed in the night riding workshops I've done
    for my club, and by the spontaneous compliments I've gotten from
    motorists.

    - Frank Krygowski

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