... Single or Double buble Switch Brightness 1, This on-camera Video Light used halogen light bulb 10W+10W, the light illumination ... F750 operating time is about 80 minutes; 2,This dimmable Video light ,single, double lamps power control, hold the strength ... 3, The built-in intelligent control electric circuit, causes the photo source steady output whenrun longtime, brightness is consistent throughout; 4 ...