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U-bent fluorescent bulbs come with either 6 inch (T8, T12), 3-5/8 inch (T12) or 1-5/8 inch (T8) leg spacing normally designed to accommodate 2 x 2 ceiling fixtures found in offices, medical centers and many other occupancy types. To comply with Federal energy standards, 25 watt and higher 2-foot U-lamps must produce 84 lumens per watt at color temperatures less than 4500K. Bulbs not meeting the standard will be available only while existing stock lasts.