The 16 Watt DD Style 4-Pin CFL Fluorescent Lamps by Crompton are available in 3 Colour Temperatures; Warm White (2700K), Cool White (4000K) and White (3500K). These bulbs are generally used in slim profile decorative and exterior light fixtures in both domestic and commercial applications as they offer instant illumination and high colour rendition. With a 1050 initial lumen output, these sturdy bulbs have been tested up to 10,000 hours of life. Main Features: 10,000 hour average life 82/1B colour rendering index/group GR10q 4 Pin Cap Internally fused for safety Technical Specification: Watts: 16 Volts: 240V Bulb Cap: GR10q 4-Pin Colour Temperature: WW/CW/W Initial Lumen Output: 1050 Dimensions: 135mm Diameter x 135mm Length Energy Rating: B Lifespan: 10,000 Hours Fused: Yes Specification Sheet Note: Seperate ballast/control gear required. Not suitable for dimming