Under the normal light intensity,it can work 72h when it basked for 8h. 4.Aluminum alloy body with high resist compression is about 10-50 tons. 5 Display: φ5 bright anti-fog LED, color can be customized. 6.working mode: flashing (2Hz + 20%) and steady light. 7.Lighting condition. front light brightness < 500Lux.