VegieMaster 4-ft, 4-Tube T5 HO Fluorescent Hydroponic Grow Light Fixture for Indoor Plant Growing Grow tent, T5 Bulbs Included Known for their high lumen output and versatile hanging options, T5 fixtures are the gold standard in fluorescent power, producing twice the light output of legacy fluorescent bulbs. These new low profile T5 fixtures are lightweight, compact, and durable, and utilize premium high efficiency digital electronic ballasts to maximize the power of your bulbs. The high quality reflective aluminium captures and reflects excess light down to the grow area. T5 fluorescent lights also have a minimal heat output, allowing you to hang the fixture much closer to the plant canopy then was previously possible with traditional HID lighting. T5 lighting can also be used for supplemental lighting with an existing HID (High Pressure Sodium or Metal Halide) light system.