A pack of 5x energy saving 28W compact fluorescent CFL 2D light bulbs, which are commonly found in low profile luminaires such as those in corridors, stairwells or bathrooms.This compact fluorescent CFL 28W 2D Double DD light bulb emits a bright 2050 lumens of cool white 3500K light. Its long 10,000 hour life means that once the light bulb is installed, it will be years before it needs replacing again with a lifespan of up to 5 years. It can be used outdoors when installed in a suitable IP65 rated light fitting.Suitable for dimming - separate ballast/control gear required.Fitted with a GR10q 4-pin square push fit base. Need more help in choosing a suitable light bulb? Read our guide Choosing Compact Fluorescent Lamps