The 4-foot EYE HORTILUX® PowerVEG Tube T5 633 provides a nanometer-specific spectrum to help bridge the gap between the vegetative and flowering stages. The PowerVEG 633 promotes vertical plant growth and expands leaf size, producing a red spectral light that prepares your plants for fruiting and flowering. PowerVEG T5 tubes promote structurally sound plants ready for transition to HID where bigger and better yields and greater overall production will be seen.