Daylight color temperature of 5500K; CRI of 91 Renders colors accurately for photography Generates very little heat About 6,000 hours bulb life Flicker-free 85 watt fluorescent light bulb, super bright with 5500K color temperature and 4250 Lumens output, CRI of 91, 120V. This is an energy-saving bulb with about 6,000 hours bulb life.

Fits all medium-base E27/E26 sockets. Dimensions: Length: 10.5 inches; diameter: 3.9 inches; diameter of socket: 1 inch. Important: ALZO CFL bulb life is based on the bulb in an open-air upright orientation. When 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. Is a photography light bulb different from a general use bulb? More Features This is an extra large bulb that might not fit standard household lamps; see diagram above Fits all medium base sockets E26/E27 Energy-saving, uses about 1/4 of the energy of a comparable Tungsten bulb Specifications FAQ ALZO Compact Fluorescent Light Bulbs FAQ What is CRI Color Rendering Index? Lumens and Lux, Definition of Light Measurement