Goodlite G-20243 F54T5/850/HO/ECO Straight 54-Watt 45.80-Inch Inch T5 Linear Fluorescent Lamp Mini Bi Pin Base, 5000K, 40-Pack G5 Mini Bipin, 45.80" long, Good Efficiency 75% less energy than incandescent, 5200 Lumens More than 100++ lumens/watt (efficacy) Bulb Meets Federal Minimum efficiency Standards Brand Cross Reference F54T5/850/HO/ECO - F54T5/850/HO/ECO - F54T5/850/HO/ALTO - FP54/850/HO/ECO CRI 85 800 series high quality triphosphor coding Energy efficient, an environmentally responsible lamp low mercury meets TCLP requirements Works with INSTANT / RAPID Start Fixtures, Long Life: 25,000 hour ,Bulbs sleeved safe wile shipping