1000w light distance

Jumfrey13

Jumfrey13

Active Member
No glass on my magnum xxxl hoods. I am being told many different things. I've read on here that plants get up to 8 inches from the glass and do fine. of course that guy is using the glass and probably has proper AC. I have a badass AC. Most people say to keep it about 1 1/2 feet away. Last night, a guy told me to keep them 4-5 feet away. I look at pics from the professional warehouses online, and some of them show their lights way high above the canopy. I am so confused.
 
Right. I just keep seeing big grows with lights that are over 4 feet above the canopy, and it's puzzling.
 
Check the temp at canopy level. That's best way to see for your room. With no glass id say minimum 16 inches.. Closer to 24 is best . When I say minimum I don't mean it will grow best at this I say that like if your nugs finish 16 inches from bulb with decent airflow you shouldn't get light bleaching
 
A lot of the PAR readings I have seen on 1000 watt bulbs seem to suggest that 2 feet is best, if you can maintain the temps... even without glass you can exhaust those hoods which helps.
 
If people want to be technical its a loaded question. A pro would calculate lights over area and distance to get a certain ppfd at a certain height. They'd be accounting for wall reflectivity, and reflector design to get the correct overlap.

Well if your a real pro, you wouldn't even do that, you'd be hiring a specialized contractor to set everything up. Of course this wouldn't be some small time grow.

But anyways...........

There's lots of dumb people out there. If the light is close and its really warm on your hand at plant height, its too close. If the plant starts bleaching its too close.
If its so far away that light is spread on the ground where there are no plants, its either too far, or you're not growing enough plants :)

- Jiji
 
I have no experience without glass. Canopy is 12" from the bulb, which is about two inches from the glass, so my plants are only about 10" from glass. I am growing Chernobyl and Jillybean by TGA along with a friends strain under a 1k Eyehortilux Super HPS with an air cooled XXL hood in a 4x4 tent. These are finishing week five of flowering, bulb has been this close since stretch stopped, light tolerance is very strain dependent though as well. Personally, I have never had a light more than 18" from canopy.
 

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Urbz said:
I have no experience without glass. Canopy is 12" from the bulb, which is about two inches from the glass, so my plants are only about 10" from glass. I am growing Chernobyl and Jillybean by TGA along with a friends strain under a 1k Eyehortilux Super HPS with an air cooled XXL hood in a 4x4 tent. These are finishing week five of flowering, bulb has been this close since stretch stopped, light tolerance is very strain dependent though as well. Personally, I have never had a light more than 18" from canopy.
Click to expand...
Lovely
 
With open bulb MH, less than 18" seems to cook them. I keep a graduated 24" stick handy for checking things. So, MH I keep around 20" and HPS around 18". My cool white T5s in my cloning cabinet can be within a couple inches...let them grow into the light and it too will bleach. Last grow I augmented my HPS with T5 blues and while I think I could have gone closer I kept it at the HPS height.
 
patrickkawi37 said:
Mine are at 30 inches right now with small signs of heat stress couple days into flower .. "Occupation as 'means of livelihood or gain" I like that . So im a pro then . I feel good now
Click to expand...
I deff got light burn and slight bleaching on my h-scrog under two 1000k w se ac hps. That was at 24inches, now at 32in .
20210430_221313.jpg20210429_212734.jpg
I'm going into wk 7; is this reversible or have I already done quite a bit of damage to quality of end product? Under the other flower room 2 and 3 v-scrog cmh's and QB's doing great.

Harder to keep Temps down now due to increasing outside Temps. U can see from pic bleaching and leaf clawing/curling. Temps are 74 to 78 F lights ON, 67F to 72 F lights off,, RH 47% to 53 %Gelato41.
Screenshot_20210506-211657.jpg
 

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