An A+ energy rating, a retrofit pin base, 4 watts and 345 lumens: are you ready for these light bulbs to light up your life - or at least your living room? They use the latest LED technology and components to ensure superior light output and to offer excellent energy savings when compared to halogen or incandescent equivalent products. Designed to be dimmed, they omit a warm light instantly, giving you that cosy feeling for up to 15,000 hours. Pack of 2. 4 watts. GU10 fitting. Energy efficient. 10 yrs bulb life. Can be used with a dimmer switch. Colour rendering index 80 - this is a scale from 0 to 100% indicating how accurate a light source is at rendering colour. The higher the better. Colour temperature 2700K. 0.5 pf. Rated luminous flux 345 lumens. This is a measure of light and indicates the power of the light emitted. Rated lamp life 15000hrs. Number of switches 40000. Smart lighting information:Suitable for indoor use.