Zebralight H600 Mk II 18650 XM-L2 Headlamp Cool White - 1090 Lumen High: H1 1090 Lm (PID, approx 2 hr) or H2 660 Lm (PID, approx 2.5 hrs) / 350 Lm (3.9 hrs) / 160 Lm (11 hrs) Medium: M1 70 Lm (30 hrs) or M2 32 Lm (66 hrs) / 12 Lm (172 hrs) Low: L1 3.7 Lm (16 days) or L2 0.4 Lm (2.5 months) / 0.06 Lm (4.6 months) / 0.01 Lm (5.5 months) Beacon Strobe Mode: 0.2Hz Beacon at Low / 0.2Hz Beacon at H1 / 4Hz Strobe at H1 / 19Hz Strobe at H1