... 4) Self-reliant in LED light source LED Downlight 3W, 7W, 10W, 12W, 15W, 18WSpecification Product ModelGPD10303xxGPD10407xxGPD10510xxGPD10612xxGPD10815xxGPD11018xxSize3 inch4 inch5 ... lowest lumens decline<3% after 1000hrs;3) Isolated power, constant-current driver, no flicker;4) Instantly ... ceiling lamp, down lamp light source2) Corridor lights, architectural point of light, windows Gallery lighting.3 ...