Phantom,
I don't have any Q5 lights from DX (yet), but I took this...
http://www.dealextreme.com/details.dx/sku.6965
and swapped to a Q5.
With the stock driver circuit, it measured 13,500 lux @ 1 meter with (2) 18650 batteries. Running around 700 ma to the emitter, it doesn't get hot at...