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T12 fluorescent tube fits 48 fixtures and uses the same ballast as the T12 tubes that EPACT outlawed as inefficient. 34-watt bulb offers a color temperature of 4100 Kelvin for Cool White light, high color rendering (87 CRI) and 1,800 lumens. This low-mercury lamp (F34T12/CW/C/ECO) lasts approximately 15,000 hours."