You need a good grow light that puts out very little heat and the ideal candidate is a LED grow light. Good LED Grow Lights are compact and run so cool that you put your hand on the light when it’s running. Just make sure you have at least a 40 Watt LED grow light - smaller lights, no matter how much cheaper they are, are a waste of your money because they don’t put out enough light. And don’t bother with a High Pressure Sodium and Metal Halide grow light. Either of these lights will turn your grow cabinet into an oven. Also florescent grow lights small enough to fit inside the cabinet don’t put out enough light in the targeted bands that LED grow lights do.