This 4' 8 lamp High Output T5 fixture comes with your choice of bulb spectra, so you can customize the light your plants get to their precise needs. The housing is powder coated to withstand humid environments without rusting or corroding. Two switches on the side to control whether you want four or eight lights on at once. Highly reflective German aluminum interior with 96% reflectivity. Check out how this fixture did in our "Best T5 HO Fluorescent FixtureComparison Test and Review"