17 Watt T8 High Performance Tube, Medium Bi-Pin Warm White 30 PackWattage: 17Average Rated Life: 20,000 Lumens: 1,350 CRI: 73 Light Appearance: Warm White Color Temperature: 3000K Length: 24″ Diameter: 1″ Base: Medium Bi-Pin Fluorescent 17 watt 3000K warm white T8 high performance straight tube features a medium bi-pin base, provides a light output of 1350 lumens at a color rendering index (CRI) of 73 and can last an average of, 20,000 hours.