1. The back light , activated by a separate key, is very bright. 2. The vertical angle of the back light can change the effect. 3. The only light comes from the houseboat's back light , courtesy of the generator. 4. The first option is using Light Emitting Diodes ( LEDs ) to back light . 5. The bar is decorated with handmade glassware and bathed in a soft blue back light . 6. The back lights were broken out, so I spray-painted red paint over the white lights. 7. Someone flips the back lights on, illuminating the water. 8. It is formed by; the Key or main light, the fill light, and the back light . 9. And above that, the setting sun is a back light to a thick gathering of clouds. 10. When artificial, the back light is usually placed directly behind the subject in a 4-point lighting setup. 
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