Light output: high - 80,000 candela peak beam intensity and 145-Lumen measured system output; low - 40,000 candela peak beam intensity and 70-Lumen measured system output Ultra-bright blue taillight LEDs make certain you can be seen even in thick smoke Run times: steady high LED and taillights: up to 3 hrs to the 10-Percent output level; low: up to 6 hrs Deep-dish parabolic reflector produces a tight beam with optimum peripheral illumination to aid in navigation; Optimized electronics provide regulated intensity