What is infrared (IR) radiation? Which grow lights emit infrared and is it a good thing or a bad thing for your plants? We look of the best and most popular grow light technologies: LEDs, HPS, DE-HPS and try to understand how radiant heat (near infrared) could be interacting with your plants to affect crop quality and performance—and also how reflectors absorb and re-emit IR. Hellion DE-HPS US / Canada Direct Sales: Call 1-844 202 5666