Goodlite G10746 F28T5/841/ECO Straight 28-watt 45.80-Inch T5 Linear Fluorescent Lamp Mini Bi Pin Base, 4100K, 40-Pack G5 Mini Bipin, 45.80" long, Good Efficiency 75% less energy than incandescent, 3000 Lumens More than 100++ lumens/watt (efficacy) Bulb Meets Federal Minimum efficiency Standards Brand Cross Reference F28T5/841/ECO - F28T5/SPX41/ECO - F28T5/841/ALTO - FP28/841/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