TCP 32018Q35K10 fluorescent Quad Tube - 18 Watt (1150 Lumens) Bright White (3500K) 2-Pin (G24d-2) base Quad Tube PL Lamp, 10-Pack Long Life, 10,000 hour average rated life Lower maintenance and labor costs for lamp replacements Lasts 7 years, based on 3 hours use a day Bulb lasts 10-13 times longer than similar incandescent bulbs Perfect for most commercial applications