Metal halide grow lights generate the most heat, while LEDs generate the least heat. HPS lights are in the middle, generating more heat than LED lights, but not as much as metal halide lights.
How Do I Know My Grow lights Are Harming My Plants?
This is a first-time grower. I received my friend’s old grow lights. They are square panels with bottom-mounted blue and red LEDs. The issue I’m having is that they have absolutely no labels, thus I have no idea how effective they are. How can I tell whether these lights are damaging my plants?



