The (4 Pack) of Hydrofarm Quantum T5 grow light fixtures (No Bulbs Included) produces color and light much closer to that of regular daylight than the leading competitors resulting in tighter inter nodal spacing, thicker stem walls heartier foliage and natural increases in extracts. All of these come together to create a much healthier plant while enhancing the natural characteristics of each specific plant. With fluorescent fixtures use high efficiency, digital electronic ballasts to power the high output T5 fluorescent lamps. It features a low profile, wider bulb spread, wider reflector angles, and very low heat, allowing it to be placed close to the tops of plants. Placing the high output fluorescent fixture close to the tops of plants provides a very intense, bright light over the area. The large area of light dispersal delivering 28% more lumens, coupled with the intense light is what makes T5 perfect for plant growth.