ALZO 85W CFL Photo Light Bulb 5500K, 4250 Lumens, 120V, Daylight White Light This is an extra large bulb, see dimensions in diagram above 85W compact fluorescent bulb with daylight color temperature of 5500K, 4250 Lumens output, 120V, CRI of 91, flicker-free; the daylight balanced color temperature renders colors accurately for photography Energy saving with about 6,000 hours bulb life; Fits all medium-base E27/E26 sockets Dimensions are 10.5 inches length and a diameter of 3.9 inches; generates very little heat 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 reduced.