Check the listing for details. ALZO 27W CFL Photo Light Bulb 5500K, 1300 Lumens, 120V. Condition: New. Listed at 3.57 USD. Daylight color temperature of 5500K; CRI of 91 Renders colors accurately for photography This is a large bulb that might not fit standard household lamps; see diagram above About 10,000 hours bulb life Flicker-free 27 watt fluorescent light bulb, super bright with 5500K color temperature and 1300 Lumens output, and CRI of 91; daylight balanced color temperature renders colors accurately for photography. This is an energy-saving bulb with about 10,000 hours bulb life. Fits all medium-base E27/E26 sockets. Dimensions: Length: 6.5 inches; width (diameter): 2 1/4 inches; length socket base to top of ballast: 2 3/4 inches; diameter of socket: 1 inch. ALZO CFL bulb life is based on the bulb in an open-air upright orientation. When ALZO bulbs are installed in fixtures that lack adequate ventilation, the life of the bulb will be reduced. If an ALZO CFL bulb is installed in an overhead recessed light fixture with the bulb glass below the base, the life of the bulb will be greatly reduced. ALZO warranty for all CFL bulbs is 30 days. Is a photography light bulb different from a general use bulb? More Features Fits all medium base sockets E26/E27 Energy-saving, uses about 1/4 of the energy of a comparable Tungsten bulb Generates very little heat Specifications Wattage (Energy Used): 27 watt Lumens (Brightness): 1300 Color Temperature (Appearance): 5500K CRI: 91 Voltage: 117 UV-A @1m: 0.001mw/cm2 UV-B @1m: * >0.000uw/cm2; *Not within the range of our meter. Note: UV-A from sunlight midday = 5-10mw/cm2 Frame Rate: ALZO CFL and LED light bulbs can be used at frame rates up to 1000 fps without any flicker; they are true continuous light sources. Bulb Life: (based on 3 hrs./day) 9.1 yrs Estimated Yearly Energy Cost: (based on 3 hrs./day and $0.11/kWh; cost depends on rates and use) $3.25 Dimensions: Length: 6.5 inches; diameter: 2.5 inches Disposal: Contains Mercury / For more on clean up and safe disposal, visit epa.gov/cfl FAQ ALZO Compact Fluorescent Light Bulbs FAQ What is CRI Color Rendering Index? Lumens and Lux, Definition of Light Measurement