I said I write a little guide, so here it comes. How much is to much and how do I check it? If you checked into lights to grow indoor, you will run into some fun diagrams of light foot prints. Those help you to put the lights at the right distance. All good lamps provide you with the hanging distances for each stage Germination, Vegetative and Flower.  If you build your own lights, you run into the issue, that you are a bit clueless, how to hang your lamps. Best to get that sorted