10 watt EarthBulb LED linear tube is available in 4000K. Great light output and perfect for replacement of T8 fluorescent tubes. This linear tube provides 1450 lumens and has a CRI of 82. This lamp is engineered for high lumen maintenance over its 50,000 hour rated life. Simply “plug and play” on electronic fluorescent ballasts. Compatible with instant start and program start ballast. Also compatible with fluorescent emergency ballasts.