Xenon Bulb 3.7V 10W

Pros: I bought the 9V Superfire incadescent torch but the runtime was too short on old RCR123A's. It was a little dim and orange on an 18650 so I thought this would be an easy solution.
Also discovered that the bulbs in these modules are not replaceable after recieving some 4.2V bulbs, if the bulb blows you need a new module.
It is pretty bright on one 18650, possibly brighter although the hotspot is narrower.
The beam pattern is not as good as the module that came with the torch, and the bulb is off-centre.

Cons: Not a P60 drop-in, it has a smaller diameter and the centre spring is shorter than the outer spring, although I was able to stretch it out to allow contact.
It rattled around loose without making electrical contact but fortunately I have a rubber o-ring kit and was able to get it working with two o-rings of approximately the right size.

Other: Acceptable solution for a non-P60 1x18650 incandescent torch, fortunately I was able to adapt it and use it.