These 42 Watt Triple Turn 4 Pin G24q-1 Type Bulbs from Crompton are a Low Energy PLT lamp available in two colour temperatures: White (3500K) or Cool White (4000K) Tested to 10,000 hours and with Cromptons unique Spectra-Plus coating, these bulbs are triphosphor coated for excellent colour rendering, high output and a long life. Compact TE fluorescent lamps are commonly used in commercial and domestic luminaires such as downlights, bulkheads, pendants and other suitable energy saving applications. Suitable for dimming and use in emergency lighting. To be used with an external starter or electronic ballast, these high performance bulbs can be installed instantly on arrival to brighten up your home or business. Main Features: Energy Efficient Bulb Long 10,000 Hour Life White, and Cool White Bulb Options G24q-1 4 Pin Cap Bulb Technical Specification: Volts: 240V Watts: 42W Cap Type: G24q-1 4 Pin Colour Temp: White (3500°K) Cool White (4000°K) Lumen Output: 3100 initial output Burn Hours: 10000 Height: 163mm Diameter: 49mm Energy Saving Rating: A Dimmable?: No Specification Sheet 1 Year Guarantee Included