Tru Blue lamps are the only true T5HO lamp for vegetation cycles and are designed to provide the complete blue spectrum to optimize overall vegetation quality and stability. 54W T5HO PERFORMANCE Initial Lumens: 5,000 Rated Life: 20,000 hours Color Temperature: 6500k Color Rendering Index (CRI): 85 Diameter: 0.625 in Length (MOL): 45.2 in Base Type: Miniature Bi-Pin Weight: .06 lb / .02 kg