GTI Fluorescent Replacement Lamps 60in - F58T8/CM65F58T8 CM65 GTI T8 d65 Replacement Bulbs GTI Colormatcher 6500K lamps The precise spectral characteristics and lumen output are subject to an exhaustive quality control process to assure that each lamp provides true full spectrum, color balanced illumination and extremely accurate color rendition. The model number of the bulbs contain the size, wattage and type. For example: When looking at the model # F58T8 CM65. The first number 58 is equal to the