... middle of the switch on the light is “OFF”position,when you push the switch to “AC ... the lamp is for always bright lighting.and push it to right “DC”When power outage, ... , all kinds of passageways, and so on.Advantages:No Moisture while lighting.Dimmable for different brightness ... incandescent bulb, 88% energy saving.Environment Friendly, No UV, no infrared, mercury free.Little heat, little power ...