desertrat
Well-Known Member
Got it - I have to wait for house guests to take off this afternoon then I'll take equivalent measurements.
Myth busters its the light
- Thread starter desertrat
- Start date
GeeBee3000
Member
Wow this is some very good info. I had to read it five times for to make sense but it damn it was some good info. DesertRat I wanted to ask you a question. I have some OG Kush Mother Plants plants that I've been keeping in a cooled room with no light for about a 5 days now. Will no light harm or kill the plant?
desertrat
Well-Known Member
Now I'm back down where I can give a coherent answer. I love my hobby. You might have triggered some flowering hormones but I can't imagine they won't bounce back.
desertrat
Well-Known Member
12 inches from bulb is too close but 12 inches from hood at opposite end from bulb is about right. With four 600 watt lights you'd have to raise the lights further until the lumens per square foot were back down to 10,000. It would be about 42 inches above plants, a little less.Nice thread, i would like to know what the meter says at 12" for a 600 eye super hps .i try to keep my canopy from 12" to 30" from my lights. most everything below 30" gets cut off, too fluffy for me.also would your numbers be different if you put the meter under 4 600 hps right in the middle?I would think your lumens per sq ft would be way different.another good test would be to take the meter outside and cover it with one big fan leave for a reading. then do it under a hps.i gotta get me a light meter, you just cost me moneyI'm baked.
sixstring2112
Well-Known Member
good info, when you say 12" is too close do you mean for heat or thats too much actual light for the tops.I run twin 600 hps in a dual cooltube 48" and thats where i have it now.I also have 2 mh 150 and 2 hps 150 in the corners at about 8" from the canopy.
deprave
New Member
bigv1976
Well-Known Member
Yeah great post but the only way a 600 produces 10,000 lumens per square foot at 21" away is if your grow area is about 6" x 6". Check the chart. A 600 only produces 95,000 lumens at the source so that light would have to be pretty close to put out 10,000/ sf according to the light los chart I attached.
LeeroySlim
Active Member
great thread mate learned alot
deprave
New Member
One thing I am observing in my first grow is you really got to account for the size of your plant, If you are following that chart then 10" at the canopy with 3-6ft plants then the bottom of your plant really gets horrible light in comparison to the top even the unshaded branching. I think side lighting or some vertical lights is really important for the bigger plants, what do you guys think?
This is why it seems to be scrog is so popular and using smaller plants in SOG with horizontal lights
For big plants vertical cooltube and tons of them 3 or 4 vertical 1000WATTS per plant that is about as close as we can get to the sun on a big plant although its not even close to the power of the sun as desertrat has illustrated
This is why it seems to be scrog is so popular and using smaller plants in SOG with horizontal lights
For big plants vertical cooltube and tons of them 3 or 4 vertical 1000WATTS per plant that is about as close as we can get to the sun on a big plant although its not even close to the power of the sun as desertrat has illustrated
LeeroySlim
Active Member
i agree...........
Rocky Mountain High
Well-Known Member
Thank you much for the insight, I appreciate it Desertrat !
desertrat
Well-Known Member
Sorry, you're reading the chart wrong. It shows 10,000 lumens per square footb(foot-candles, they're the same.) for a 600 watt light at 20.5 inches from the bulb, just as I've said. It says nothing about the surface area getting that light but you can calculate that by multiplying pie times diameter squared and you'll get roughly 9.5 square feet that sees the 10,000 lumens per square foot.
desertrat
Well-Known Member
Exactly right but you'd have to put a larrge light on each side of the plant to duplicate an outdoor plant with plenty of space.
right again
desertrat
Well-Known Member
you're running at over 20,000 lumens per square foot at 12 inches from the bulbs of the 600's - so that's pretty high compared to the recommended range of 7000 to 10000 lumens per square foot. But I've come to doubt the recommended ranges and your post is just more evidence.
Do you see any signs of leaf bleaching directly under your bulbs? Have you ever put the lights closer and seen bleaching?
desertrat
Well-Known Member
I should mention that this chart is what I will be testing and what I suspected - that our plants can take much more light than the recommended 7000 to 10000 lumens and are actually getting much more light in many successful indoor grows.
Illumination
New Member
Awesome ideas desert +rep ... Here's an idea for a meter..Use a photovoltaic cells which convert only the light frequencies that our plants use to electricity then you will have a meter that measures only those frequencies so as to truly give us the info on what our lights are really providing the plant... follow?... 'Scribed
Namaste'
"A state licensed personal medical grow...Thank you"
ps-any verification as to the accuracy of Riddle's meter? as I own the same onekiss-ass
desertrat
Well-Known Member
still sorting the meter question out so not willing to commit publicly.
First experiment - based on the lighting penetration chart my plants should be able to tolerate up to 70,000 lumens per square foot. I'm not that brave so I'm going to shoot for about 30,000 lumens per square foot at the top of the canopy directly below the bulb, approximately 12 inches. The purpose of the experiment is to observe if there is any bleaching at this light intensity. Based on my prior grows I don't expect any problems at this light intensityl
Denofearth69
Active Member
Hey desertrat, Let me open that ol' LED can of worms. I've been using LEDs to veg, and a combo of LEDs and floros to flower, and thus far I like the results especially in veg, as LEDs seem to have really good penetration to the bottom of the plants, and nodes are very close together. Also clones really thrive under LEDs. The place I bought mine from www,thegreenleaf.biz has some information regarding the different wavelengths of light that plants need, and how LEDs address this need. Also, their info says that LEDs have to be measured with a PAR meter, and not a standard light meter. This, they suggest, is because LEDs read low in lumens, but high with a PAR meter. Not sure what a PAR meter reads, and just wondered if you knew anything about that.
OZUT
Active Member
Reps first brother...not everyday when someone posts something useful like this...
I actually tried this on my last grow...pushed it to the max....I had (4) 600's running in a 5x14 area and decided to mess around with the distance....With one of the lights, I had the tip of the plants less than 2 inches from the glass...figure the bulb is a couple of inches from the glass, the tip of the cola was less than 6 or 7 inches from the source...The master kushes didn't take too well and I think it was just too much light for it to process but the white widow/banana kush right next to it exploded with growth...It really took the distance well....The master kushes under the other lights that were at 12 inches were amazing, so I think it depends on the strain and not all of them handle the distance the same.