URI 48" Actinic White V-HO T5 Replacement Lamps are 54 watts with an HO ballast and 85 watts with an IceCap ballast. They are described as V-HO bulbs instead of VHO or HO bulbs because they can potentially be either HO or VHO.12K Utilize a proprietary blend of unique phosphors exclusive only to UVL (URI).Dual coated phosphor and long mounted filaments to achieve long lifeNo color shiftActual length from pin to pin: 46"