LuxStar8 4' T5 Fluorescent Light (Grow Bulbs)The LuxStar 8 T5 fluorescent lights are highly efficient light sources that work wonderfully well in limited grow spaces due to their low profile design. The grow light comes pre installed with a ballast which keeps a check on the power fluctuations keeping the fixture safe against sudden power surges. With the dimming feature, the light output can be adjusted by 50%, letting you create your light recipes. Space Saving Lights: The light has a low