The 38 Watt DD Style 4-Pin CFL Fluorescent Lamps by Eterna is available in a 3500K White Colour Output. 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 2800 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: 38 Volts: 240V Bulb Cap: GR10q 4-Pin Colour Temperature: W Initial Lumen Output: 2800 Dimensions: 200mm(Height)x200mm(Width)x32mm(Depth) Energy Rating: A Lifespan: 10,000 Hours Dimmable: No Ballast Required: Yes Driver Required: No Transformer Required: No Specification Sheet Note: Seperate ballast/control gear required. Not suitable for dimming