5000k daylight compact fluorescent standard spiral bulbs are an excellent choice for digital camera photography. it generates a close match to natural daylight and a crisper view of the items being illuminated. Technical Info: Manufacturer: Long Star lighting; Color Temperature: 5000 K, daylight; Watts: 40 Watt; Incandescent: 150 Watt; Light output (LM): 2650; M.O.L H: 6.37 inches; Diameter D: 2.68 inches; Base Width A: 2.36 inches; Base Height B: 2.70 inches. Features: Average Life: 10,000 Hours; Approximate Incandescent Equivalent: 150 Watts; Save 110 Watt in Energy; Flicker-Free; E26 standard screw-in base; CRI (Color Rendering Index) > 84; Designed for 120V/60 HZ. Do not use with timers, dimmers, or exposed to the weather.