VEVOR 80PCS LED Storefront Lights, 41 ft, LED Module Lights, 5050 SMD 3-LED RGB Color Changing Window Lights with Remote Control for Business Store Window Advertising Letter Signs, IP68 Waterproof

The light cannot be covered. If the light is covered, the color brightness will not be that high, which will also affect the color.

Yes, it has dimming function. There is a controller in the box that can change color adjust brightness, etc.