Why are all reflectors so high above canopy at every professional grow op??

Every air cooled hood I see in huge grow ops keep there hoods like 36 inches away with huge buds. So why do people say 12-18 inches??

Tham.. good question.. I never thought about it but the only answer i can think of is that comercial grower is running about 1000s and the noobs usually start with like 150s or 250s thats the only answer I can think of.

Use the search bar there's a thread recently about this with some lengthy explanations.


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kmog33 said:

Use the search bar there's a thread recently about this with some lengthy explanations.


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Click to expand...

Recall the thread title or suggest search terms?

I got the idea of keeping light high from greengenes. I think part of the logic is that lamps are set high when par is high and reflectivity is very good

testiclees said:

Recall the thread title or suggest search terms?

I got the idea of keeping light high from greengenes. I think part of the logic is that lamps are set high when par is high and reflectivity is very good

Click to expand...

https://www.rollitup.org/p/12471743/

"I'm just going to state this because I couldn't really find it anywhere else in the thread in regards to the op. A big difference between professional facilities and home growers is that there are 100 lights in a sealed/controlled environment. Tons of light overlap and reflective walls to collect and push the light back into the canopies. Now a big room with say 2 million lumens in it, is going to have more light regardless of how high they are than your single hid/led/flouro/whatever.

As a note for tent growers, there really isn't any need to have your lights close as light is absorbed by the plants, so as long as the light is sealed in your environment, some foliage is benefiting from it. I run my 600 hps at the top of my 7.5' tall 3x5 and don't have any density issues at all. There are so many other factors that contribute to yield/density/potency that as long as you have a good light source, you really should be focusing on things like your root system before you try to be scientific about light placement.


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Apr 2, 2016 ReportReply"

Ford Racing said:

Every air cooled hood I see in huge grow ops keep there hoods like 36 inches away with huge buds. So why do people say 12-18 inches??

Click to expand...

Running dozens of lights not just 1 lolz and they are prob 1000 watts and the temp is what makes most buds thin and genetics is the majority of the rest of it

i believe, BECUZ, they have money we don't have and can afford to pay the bill instead of somebody to move and adjust the lights all the time. they probably don't care to lose out on that as long as the area is easy to maintain. probably keeps the plants growing uniformly. But yeah, probably just comes down to being part of the budget they have and we don't...

I run two 600's in a 9x10 room with reflective walls. I never raise or lower them, I just leave them 6 feet above the floor and let the plants grow up to them. I used to try to keep them close but see no difference so why deal with it?

If they are greenhouse ops, they use the lights for supplemental light or longer veg times.

Maybe they pick them up and out of the way for pics/videos.

It just seems odd. Every pic I've seen there up about 24-36

They already obviously have ample light reaching the canopy, so there's no need in risking burning the plants by moving them closer.

Temperature/humidity are as important to growing as light.

No to mention that too intense of light can be counter-productive and burn/bleach the plants on its own.

Compound lighting

They're all running 1000w De's with small hoods that force all the light downward. The De's are pulling 1150 watts so they produce a lot of heat. They're open reflectors with the ballast attached. They have to be 3 feet away at minimum. They produce enough photons to be at the distance anyway. Plus the over lapping lighting also. If they were any closer they would bleach the shit out of the plants.

Between a handful of posters, you have all the right answers lol.

I work as a consultant for cannabis caretakers in Michigan and have worked in some decent sized growrooms.

The main reasons...

1. Heat. A cool plant with a light farther away will always perform better than a hot plant with more light intensity.
2. Cannabis doesn't get that much constant light naturally. Outside there's cloud cover, shade, etc. Getting the most intense possible light all the time in an artificial environment is not something they desire. With all the cross lighting that goes on when you've got multiple hoods, and just having all those hoods...you've got enough light that you can have them raised up higher.
3. A note on the hoods. You take the glass off the hoods. Even if you clean your glass everyday, the gains you get for cooling don't make up for what you lose in light intensity. It's more economical to invest in a quality air conditioner.
4. Root zone and canopy management is what really matters. Developing a quality root zone and shaping and pruning your plants so that you get as much light penetration into the lower levels as possible; making sure there's not spots in your room where light touches but there's no plant for them to touch. Those do more for your yield and bud quality than hood to canopy distance. Some growers use scrog set ups to avoid having to worry about light penetration but in my experience the labor and time that has to be put into a scrog set up is not cost effective on a large scale. Pruning is more cost effective and less labor intensive.