haha! bstrickler, you zinged me. Love your link
I'm a hard core googler, I have Google on my phone, my tablet and on 3 monitors in front of me. Heck I can even have my gf google stuff on her phone from across the room, I just didn't think of the correct terminology "under driving" Thanks for the help boss.
"underdriving" is what came to mind, when people like to talk about overdriving bulbs (pushing them beyond their technical limit, to get more power out of them).
LMGTFY is such a useful website, because it's helped me teach people to search for things before they ask, although in your case, it was a helpful question.
I'm just surprised nobody has done any long term tests for underdriving bulbs, since that's a very common question people ask about the P60 and 17670/18650. I think I may have to do that test myself, and see what happens. Worst case, it goes *poof* after a few hours, or best case, does nothing. I have a battery charger that lets me set the voltage, so I think I'll try that tonight or tomorrow.
LED drivers probably was never designed to drive something with such high impedance... I wonder what the chip is thinking when the feedback pin is sending this erratic information. Battery hazards aside, I think the driver is going to be short lived
At least it's a Surefire, so if it craps, he just sends it in to them, and tells them it wouldn't turn on.