I have a drop in for an old Petzl head lamp from the same supplier. I have not used it so much but it seems ok. No heat sink but it's only 120 lumens.LOL, do not waste money on that crap from ebay. that led is not even soldered to a metal core board, never mind 700lm at 350lm that led will cook itself.
as far as multimode, the driver will switch mode if you turn it off and back on within few seconds.
not really, looks like leds are soldered to same kind of board, but for 120lm that is fine, not for 700, nor even 500.I have a drop in for an old Petzl head lamp from the same supplier. I have not used it so much but it seems ok. No heat sink but it's only 120 lumens.
Do you think these are better built?
Maglite D & C Cell 3 and 10 Watt LED Bulb Upgrade Conversions
TTS Maglite Cree LED bulb upgrade conversions for the 2 to 6 cell D & C cell torch.thetorchsite.co.uk
I'm located in Europe so order this from USA make it a little bit more expensive and complicated.I would go with this company, just to be safe.
Maglite LED Conversion Kit for 2,3,4,5,6 D cell and C cell Maglights Flashlights
325 lumen instant upgrade with Luminus SST40 LED for super bright light and long range.lumencraft.com