Besides, that is only 9000LM
@potsy
How about
THIS 12000LM or
THIS 15000LM which are half the price of your limp 9000LM unit
See, that just irritates me. Cree rate their LEDs at ~1000lm. (Some go as high as 1050 depending if you've a T6, a U2 etc.).
http://www.cree.com/LED-Components-and-Modules/Products/XLamp/Discrete-Directional/XLamp-XML2
There's just no way that 9x Cree can ever be more than about 9k and that's assuming optimal conditions... which I can guarantee there won't be.
Anyway, I've got me one of these:
http://www.ebay.co.uk/itm/New-SKYRA...ing_LightsLanternsTorches&hash=item58ba43b1f6
It's still pretty insane how bright it is. My field testing with my own Ultrafire 3.7V, 4Ah cells suggests it starts to fade after about an hour, but you can eke out about another 30m on 'full blast'. I've been running it on 'low' for 2 hours now and it's still running. (But low is still a lot of light - even whilst going dim, it was still enough that I reckon I'd have got away with cycling home).
That's about the right run time given 70W max through the LEDs, and 14watt-hours per cell.
I don't want to trust it for cycling, so I've been walking the dog - it's quite entertaining when cars pull over to let you pass and you trundle past them with dog-on-lead...
The fringe benefit is - it also works as a handwarmer. It gets proper toasty when running at full blast (not too hot to hold, but you'll definitely notice the heat).