Hi,
I've got a G&P R12 light (typical 6P copy), running of either 3 x 3v or 3 x 3,7v rechargeable.
I bought a Solar force (Probably horrible china quality) Q5 lamp for it, but it doesn't benefit from using 3,7v cells the same way the R12 lamp does, and i found out that i can still see better...