ALZO 27W CFL Video-Lux Photo Light Bulb 5600K, 1300 Lumens, 120V, Pack of 4, Daylight Pure White Light, Matches Color Temperature of Incandescent, Kino Flo and Osram Bulbs Set of four (4) 27W daylight CFL photo light bulbs with color temperature of 5600K, CRI of 91, 1300 Lumens output, 120V; renders colors accurately for photography Matches color temperature of Kino Flo and Osram light bulbs This is a large bulb that might not fit standard household lamps (see diagram in image section) with the following dimensions: length is 6.5 inches, diameter is 2.25 inches; fits all medium-base E27/E26 sockets Energy saving, uses about 1/4 of the energy of a comparable Tungsten bulb, with about 10,000 hours bulb life Important: ALZO CFL bulb life is based on the bulb in an open air fixture with sufficient ventilation; when ALZO bulbs are installed in fixtures that lack adequate ventilation, the life of the bulb will be greatly reduced.