Product Description Lighting Performance With high quality LEDs, the light giving off is flicker free, high brightness, natural, and eye friendly, offering pollution-free, high quality light source for you. Dimming Function Compatible with most popular dimmers on the market, and you can just dim the light as your desire. Energy Saving Replace 65W incandescent bulbs by only 9W LEDs, saving 85% on electricity bill of lighting. Instant Full Light Compare to the traditional lighting fixture, its starting time is less than 0.5s, no need to wait for warming up the lamp. High Quality Lower Maintenance Cost. Extremely long life reduces re-lamp frequency. Save your effort to replace bulbs in high ceiling. Eco-Friendly. No lead or mercury. Solid State. Shockproof and vibration proof. No Hazardous Emissions. No UV or IR Radiation. Note: 4-Inch refers to the cut-out diameter of the lights.