An amazing A++ energy rating, small Edison screw fitting, 4 watts and 470 lumens, this pack of 2 non-dimmable bulbs are the perfect pair for creating a calming candle-lit effect in your home. Lasting up to 15,000 hours. They save 85-90% energy compared with incandescent bulbs with zero UV emission. Omitting a warm light instantly, giving your home a cosy, comforting glow. Pack of 2. 4 watts. Small 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 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.