It's been mentioned before that LED lights are not particularly effective in smoke. The glare is terrible and has a similar effect to using your bright headlamps in a snow storm.

Xenon bulbs are more effective in smoke than LEDs, but battery life is quite poor in comparison. Still, it may be worth considering one solely for emergency use, e.g., getting out of smoke-filled buildings or subways. Does anyone here EDC a xenon light?