I've also had similar sized Tesco torches for £10 which also fit this mount. They are equally as bright but I found didn't have enough spread (i.e. the beam wasn't wide enough). Good for a helmet light, but not for the bars. Fenix good for either. Get some decent rechargable batteries, you'll get about 2 hours light from a single charge.
One of these:
http://www.fenixtorch.co.uk/led_torches/fenix_l2t.html
and one of these:
http://www.fenixtorch.co.uk/led_torches/lockblock.html
I've also had similar sized Tesco torches for £10 which also fit this mount. They are equally as bright but I found didn't have enough spread (i.e. the beam wasn't wide enough). Good for a helmet light, but not for the bars. Fenix good for either. Get some decent rechargable batteries, you'll get about 2 hours light from a single charge.