What plant grow lights generate the most heat?

I know LEDs emit the least heat. Then, what grow light emits the most?

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.

MORE: What Are The Main Types of Grow Lights?

What Others Are Asking

Can UV Light Damage Plants?

I have seen many articles on the Internet about the harmful effects of UV light. Will it damage my plants?

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?

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