When you are just getting started with hydroponic growing, you’ll likely wonder how close should grow lights be to weed plants and other plant types. Though there can be some variance between how high to hang grow lights based on the grow light type, in many cases, around 12” inches above your plants is the best spot. If you have chosen fluorescent grow lights, 12” is likely the sweet spot for your plants. Other lighting options such as LED grow lights, a range between 12”-18” may be appropriate.