LezyneHeadlight.

Easy to fit, although one of the fitting brackets was slightly deformed, but not bad enough to return the product, I still managed to fit them properly! good bright lights, that should be seen from a good distance = I'm Happy

Small, easy to fit, good for being seen, bought as backup for my cree lamp, as the batteries last longer

Reviews for these lights seem to be favourable but this was is not my experience. I don’t know if there is a quality control problem but the supplied lights were very poorly made. They look and feel cheap and nasty and when I removed the tabs from the battery compartment it was obvious that the retaining clip for the watch type batteries was so poorly made that the batteries would not stay in place and hence one of the lights just would not work. The other light was not quite as bad but the on/off mechanism was intermittent. You may be lucky and get a well-made set, but be prepared to be disappointed. Not recommended

Lights would switch themselves off when you went over a small bump. Dangerous when its the back light as you aren't always aware it has happened. Generally the switching mechanism isn't very robust and could be frustrating to set the mode. They are now in the bin.