Lemonbest&reg; Energy Saving Dimmable 4W 4x1W GU10 LED Spotlight Bulb 110V, Cool White Lemonbest high quality standard; energy saving Dimmable 4W GU10 LED Spotlight with 4 leds Low light decline with high brightness; High energy efficiency & spaced edge for heat sink Superior imported Polished Aluminum in beautiful appearance; high thermostable conjoined lens No UV or IR Radiation; 48 hours aging time; over 50,000 hours lifespan guaranteed Ideal for office, exhibition, home, indoor use. Please use LED dimmer to it.