G E LIGHTING 72119 Fluorescent U Shaped Bulb, 31W, Cool White It is GE F31T8SPX41/U/ECO 31W Cool White Fluorescent U Shaped Bulb T8 Shape 1-5/8" Leg Spacing Medium Bi-Pin Base Nominal Length: 22.5" 20 000 Hour Life 2725 Lumens 4100 Kelvin Color Temperature Low Mercury For Environmentally Friendly Disposal CRI=82