Sylvania Octron Curvalume T8 Fluorescent Lamp - 24 Watt - 16.5" Length - 1-5/8" Leg Spacing - 3500K Color Temperature - Rare Earth Phosphor - Medium Bi-Pin Base - 20,000 Hours Average Rated Life - 1,925 Lumens - 82 CRI - Suitable For IS Or RS Operation.