Efficient Sunleaves VitaLUME T5 Fluorescent Bloom Tubes provide light in the correct spectrum range to give plants exactly what they need to produce abundant fruit and flowers. Each two-foot, 24-watt bloom tube produces 1900 lumens at a color temperature of 2900 kelvins. These tubes serve as replacements for the tubes in Pioneer Jr. fixtures, but are also compatible  with any T5 two-foot fixture that will start a 24-watt tube.