An impressive A++ energy rating, an Edison screw fitting, 4 watts and 470 lumens, this pair of bulbs are ideal for gently illuminating your room. Lasting for you to 15,000 hours, they save 85-90% energy compared with incandescent bulbs with zero UV emission. Designed to omit a warm light almost instantly, they give you a cosy feeling at the flick of a switch. Pack of 2. 4 watts. Edison screw (ES) fitting. Energy efficient. 10 yrs bulb life. 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 470 lumens. This is a measure of light and indicates the power of the light emitted. Rated lamp life 15000hrs. Number of switches 100000. Smart lighting information:Suitable for indoor use.