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

Do My LED Grow Lights Need a Timer?

Hey, I was pondering whether to let natural sunlight shine on my plants during the day and turn on my grow lights at night, or do I need a timer to control the light duration for my plants? Any tips?

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