Low Consumption Light Bulb 21W E27 (T4-3U) Compact Fluorescent Lamp Features Illumination performance per watt between three and five times better than incandescent light bulbs. Long live design, averaging 8000 hours of typical use* 8-times the life of standard light bulbs. Excellent colour rendering and light distribution, daylight white is considered among experts as the best colour temperature for working enviroments and reading providing great contrast on black and white images and best depiction of colours. Specifications Lamp Base standard E27 (Thick) Power Consumption 21W Equivalent to a 105W incandescent light bulb Colour Temperature 6400k Daylight White Tube Diameter T4 / Loops 3U Approximate Length 13.0 cm* Ref: 8433325 - 152123 *Lifespan based on typical use in upright position, working under spec ranges of voltage and temperature and avoiding on/off cycles of less than 15 minutes *Measured length of actual tube and ballast without lamp base connector Index of Diameter: T2 7.5mm, T3 9.5mm, T4-12mm, T5-14.5mm, T6-17mm
