An A++ energy rating, a bayonet cap fitting, 4 watts and 410 lumens: This light bulb will light up your living space and more. These globe-shaped bulbs save 85-90% energy compared with incandescent bulbs with zero UV emission. Designed to give your living room, bedroom or any room in your home a warm cosy glow, for up to 15,000 hours. Pack of 1. 4 watts. Bayonet cap (BC) 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 2200K. 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.