Well, it's not bad [1] but it still didn't pick out the rabbit lurking in the grass at the side of the cycle path.
Said rabbit obviously jumped out just in time to go under my front wheel. No, I didn't stop to look, I was "making progress". Will inspect the bike for blood/bits of fur tomorrow.
[1] Well focussed, needs careful aiming to get the height right. Just about OK for high speed riding in the dark - as long as there's no surprises. Very cheap from seller kiter10 on ebay (and very quick delivery).