This replacement Sunleaves Satellite VitaLUME Grow Tube fits Sunleaves Satellite II and IV fluorescent fixtures. Each dual 105-watt Grow Tube emits 11,000 lumens with a color temperature of 5,000 Kelvins to stimulate hardy vegetative growth. Both bloom and grow VitaLUME TT105 tube types may be used simultaneously in either Satellite system.