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How High Should Your Grow Lights Be Above Your Plants?

2021-08-05

Now, despite LED grow lights not generating lots of heat like HID’s, their light spectrum can be overwhelming to lots of plant species if they’re hung too close. When this happens your plants will suffer from light bleaching, which will impact how your plants take in sun and convert it into energy for growth.
 
 
 
Simply put, what makes a light a “cool” blue light, or a “warm” red light, is the temperature of the light’s spectrum(s).  LED’s are much more focused on light spectrum output than energy generation, so you actually need to hang them higher above your plants than HID’s to avoid light bleaching. Light bleaching can be just as bad for your plants as overheating them and will result in an underwhelming crop.
 
LED’s don’t generate lots of heat, but you’d be surprised by how high you have to hang them above your plants. Supplemental LED lights used to grow little patches of wheatgrass, herbs, and spices (15w-90w) need to be at least 15″ away from your plants. For higher wattage lights it’s even further:
 
(240-400w LED Grow Lights) 16-30” away from plants
(450-550w LED Grow Lights) 20-30” away from plants
(600-850w LED Grow Lights) 24-26 away from plants
(900w+ LED Grow Lights) 26-42” away from plants

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How High Should Your Grow Lights Be Above Your Plants?

Now, despite LED grow lights not generating lots of heat like HID’s, their light spectrum can be overwhelming to lots of plant species if they’re hung too close. When this happens your plants will suffer from light bleaching, which will impact how your plants take in sun and convert it into energy for growth.
 
 
 
Simply put, what makes a light a “cool” blue light, or a “warm” red light, is the temperature of the light’s spectrum(s).  LED’s are much more focused on light spectrum output than energy generation, so you actually need to hang them higher above your plants than HID’s to avoid light bleaching. Light bleaching can be just as bad for your plants as overheating them and will result in an underwhelming crop.
 
LED’s don’t generate lots of heat, but you’d be surprised by how high you have to hang them above your plants. Supplemental LED lights used to grow little patches of wheatgrass, herbs, and spices (15w-90w) need to be at least 15″ away from your plants. For higher wattage lights it’s even further:
 
(240-400w LED Grow Lights) 16-30” away from plants
(450-550w LED Grow Lights) 20-30” away from plants
(600-850w LED Grow Lights) 24-26 away from plants
(900w+ LED Grow Lights) 26-42” away from plants

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