Specification Brand : Lennox Brightness : 1300 BulletPoint1 : Includes free gloves for handling BulletPoint2 : Length: Approx.: 33.18" BulletPoint3 : Bulb type: T5 style quartz glass BulletPoint4 : Base type: 4pins one end BulletPoint5 : 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. Color : Neutral White ColorRenderingIndex : 91 ColorTemperature : 5500 kelvin ConnectivityTechnology : Normal bulb ControllerType : Push Button ControlMethod : touch ExternallyAssignedProductIdentifier1 : 711091833841 ExternallyAssignedProductIdentifier2 : 0711091833841 ExternallyAssignedProductIdentifier3 : 00711091833841 ItemDisplayDimensions_Length : 2.54 centimeters ItemDisplayWeight : 16 ounces ItemName : Lennox UV Replacement Bulb (Y0391) for UVC 41W-SD System ItemPackageDimensions_Height : 50.8 centimeters ItemPackageDimensions_Length : 2.54 centimeters ItemPackageDimensions_Width : 2.54 centimeters ItemPackageQuantity : 1 ItemShape : Tubular(T) ItemTypeKeyword : fluorescent-tubes LightColor : green LightType : CFL Manufacturer : Lennox Material : Glass ModelName : 41W-S & 41W-D ModelNumber : IND-Y0391 NumberOfItems : 1 PartNumber : IND-Y0391 PowerConsumption : 40 watts PowerSourceType : Corded Electric ProductDescription : 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 FAQ ALZO Compact Fluorescent Light Bulbs FAQ What is CRI Color Rendering Index? Lumens and Lux, Definition of Light Measurement