great little light, really good penetration and spread of beam , lasts about 1hour 30- 1hr 45 on full beam. much like a slightly older joystick really. Takes the same batteries as the exposure spark, so get the rechargable ones with the charger for about 12 quid from wiggle or similar and you are laughing. I tool the headband off and just popped a velcro strap on so it attahces to a helmet and stay put really well. nice and low profile as well. There was a thread on here the other day about helmet lights where i recomeneded it as good budget offering. you can get Chinese torch jobs cheaper, but the build quality is more iffy and the chargers and batteries can be a bit, well, burn your house down if you get a crap one.