A grow light shelf is basically a box with a lid that you can place over your grow light. The box is made from either acrylic or metal and can be placed over your grow light. You can use a grow light shelf to help control the temperature of your plants, which means you can control the amount of light your plants receive. It will also help to keep the light on a constant level, which makes it easier to control. The grow light shelf will help to save space as you don’t need to put the grow light directly over your plants. If you don’t have a grow light shelf, your plants could end up receiving different amounts of light at different times.  You can use the grow light shelf to create a greenhouse effect.