Benchmark by Viribright LED T8, 4' (4-foot) High Output, Single End Powered 20W 2000 Lumen 4100K Cool White (Replaces 36W Fluorescent T8) T12 Retrofit Saves on average 50% over fluorescent (Ballast Removed) Cost Competative, Shatter Resistant design, Instant-on lighting. Cool to touch safe energy saving power source, with long lasting life 4100K Cool White (2000 Lumens) &gt;80 CRI for higher quality of light cULus Certfied (IFAR) UL1598/1598c as a fluorescent retrofit Patented Dual Redundant Safety Switches enables lower cost retrofit Thermal plastic outer shell safe for food service applications ASABE Qualified LDL Listed for rebates