Our energy saving LED bulbs are light on the planet and beautifully constructed. We don't supply our lights with bulbs, so ensure you add our exclusive, long life, brilliant, bright houseof bulbs to your order. Kelvin is a measurement of light colour. The higher the Kelvin the bluer the light output. Our houseof bulbs are around 3000 kelvins, which diffuse a warm white colour, ideal for household and task lighting.