Princeton Tec EOS Tactical 4 Mode LED 45 lumens Waterproof Light Princeton EOS Tac Headlamp is compact, military tough and is housed in an ultra light, 3-AAA Has four output modes  the strongest of which can shine the 1 watt Maxbright LED a staggering 56m 45 Lumens Output Waterproof to 1 meter for up to 30 minutes Burn time of up to 121 Hours