zebralight h604d 18650 xhp50.2 flood 5000k high cri headlamp zebralight cree xhp50.2 neutral white led, nominal cct: 5000k, typical cri: 93-95, tint deviation: 3-step. user selectable levels: 3 main levels (high, medium and low). each main level can be programmed to one of its two sub-levels. the second sub-level of the each main levels can be further programmed to different brightness levels. light output 1616 lumens. operating voltage range: 2.7v - 6.0v battery: one 18650 size (up to 69mm) 3.6-4.35v li-ion rechargeable. batteries are not included in the package. parasitic drain: negligible (much less than the self discharging of a battery). beam type: 120 degree flood. dimensions - head diameter: 0.95 inch (24.2 mm), length: 3.85 inch (97.8 mm). weight: 1.4 oz (39 gram), 3.0 oz (84.6 gram) with zl635 battery, 4.4 oz (124.6 gram) with zl635 battery and headband. additional features - pid thermal regulated outputs (three highest output levels). builtin battery protections with continuously monitored temperature, current, and voltage, plus a (2.7v) low voltage cutoff. battery capacity indicator (led flashes 1-4 times, 4 short clicks to start). automatic stepping down from high to medium, and from medium to low when battery capacity is low. durable electronic soft-touch switch. sealed and potted led driver circuitry. tempered optical grade glass. battery reverse polarity protection. waterproof to ipx8 (2 meters, 30 minutes). this light comes with three mode groups, g5, g6 and g7.