An impressive A++ energy rating, an Edison screw fitting, 4 watts and 410 lumens, this tinted glass light bulb is ideal for gently illuminating your room. Lasting for up to 15,000 hours, saving 85-90% energy compared with incandescent bulbs with zero UV emission. A globe-shaped design, omitting light at the flick of a switch. Pack of 1. 4 watts. Edison screw (ES) fitting. Energy efficient. 1 yr 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 2400K. 0.5 pf. Rated luminous flux 410 lumens. This is a measure of light and indicates the power of the light emitted. Rated lamp life 15000hrs. Number of switches 100000.