Pro lighting set up

BigCityFarmer

BigCityFarmer

Member
Just a curiosity thing as I attempt to learn. Can someone explain how / why professional grow lights are so far from canopy? It looks like lights can be 4 to 6 feet from plants in some instances, how is that efficient and what kind of PPFD would these lights put out compared to more standard 1 to 2 feet from canopy lights?
 
BigCityFarmer said:
Just a curiosity thing as I attempt to learn. Can someone explain how / why professional grow lights are so far from canopy? It looks like lights can be 4 to 6 feet from plants in some instances, how is that efficient and what kind of PPFD would these lights put out compared to more standard 1 to 2 feet from canopy lights?
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Please define what your understanding of "professional grow lights" is. Are you talking LED?

I use High Intensity Discharge lamps which were for the longest time the de-facto professional standard that stood for decades. I keep them sometimes 8-12" from my canopy (600-1000W).
 
Yeah I suppose LED or HPS. It seems all lights recommend a hanging height of between 12” and 24” inches, but then when you see a pro set up lights look several feet away from canopy. I’ve attached a random example. I’m just wondering how come in larger gardens lights can be so far away.
 

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