ALZO 85W Joyous Light Full Spectrum CFL Light Bulb 5500K, 4250 Lumens, 120V, Pack of 4, Daylight White Light,Akces Media LLC,H&PC-51742" /> THIS IS AN EXTRA LARGE BULB that will not fit most table or floor lamps; see diagram and size comparison in image section; dimensions: length: 10.5 inches; width (diameter): 3.9 inches; width (diameter) of socket: 1 inch; fits all medium-base E27/E26 sockets; pack of 4 Crisp, bright white light ideal for reading and tasks that require visual accuracy; CFL bulb has natural daylight balanced color temperature of 5500K Great for starting plant growth Generates very little heat; all ALZO Joyous light bulbs are flicker-free; energy saving, uses about 1/4 of the energy of a comparable Tungsten bulb, with 4250 Lumens output at 120V, with CRI of 91; about 6,000 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 reduced.