Ideal for me is:
3W of possible power, luxIII is fine, cree more efficient
levels Full Med Low and soooo low its like 1/3rd of a 5mm led
Boost, having a 30sec boost button is cool, from any level up 1 level
10* 25* and 50* focus or diffusion changable with instant method, could be done best with correct zoom optics
water resistant
lightweight li-ion power on back, so weight is balanced, 2400ma minimum. li-ion 40% lighter than ni-mhy or alkie
over voltage protection, no regulation for extensive declining runtime. why run out ever, drift off instead
3 strap headband, so the straps can be very loose, make the top one removable with velcro, for them that dont want one
tiltable without Clicks
padded properly so the hunk areas are soft, yet dont decompose from acidic skin oils.
Metal heat sinc, or simple lightweight metal body connected to led base for heat removal.
3oz total weight
All low profile, so it doesnt look like some contraption on your head.
AND
when you pull it off your head, it folds up and forms a hand held flashlight.
did i miss anything
oh i forgot the high brightness tritium locator, so you can find it in the dark, like the 3mmx23mm one