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A 250w light gives me 50 watts per square foot in a 2.2' X 2.2' footprint ~ 5 sq.ft
I am not using my full 3'X3' tent – more like 3'X2' with one plant ~ 6 sq.ft.
For the total 3'X3' tent, I have around 28 watts per square foot.
If in a tent or have Mylar that is highly reflective most of the light that bounces off does get used just look at under side of plants it gets light from the reflection brother fern can better explain but some does go to waste but most gets reflected back at plant and used.My guess is that your panel would do well in a space that is roughly 2½' x 2½', with the light placed at a height that allows the spectra of the various individual LEDs to mix well. Whether you would be better off with the 90° lenses in place or using only the built in 120° reflector cups would, I suppose, depend on the height that the previous statement places the panel at - if it ends up being at lower than 20" or so above your canopy, it might be best to remove them so that the illumination from the COBs is not focused on an area that is smaller than I mentioned (and also delivering more umol/sec than equatorial cannabis' light saturation point, lol).
Again, the above is purely (well... mostly ) guesswork on my part.
Err... Why a (non-square) rectangular space for a panel that appears to produce a square lit footprint? Would you not expect to see a more evenly lit canopy - with less areas of drop-off - if, whatever size area you illuminate, it is square? Also, do you have some sort of (hopefully, reflective) divider between that 2' x 3' space and the remaining 1' x 3' space inside your tent? If not, isn't all the light that is reaching any part of the volume represented by that area... being wasted?
I think you might do pretty good @ approximately 38 watts per ft.², which is what I used to come up with the area of the space I suggested above. I'm basing that on... Err... I believe that when Brother Fern tested the SE350+UVB (more or less the same design - two more COBs and sets of mono-color LEDs around them, but a generation behind in the COB technology, IIRC), he used it over a 3' x 3' space which would have given him 38 watts per ft.². He produced some nice looking buds. And in one of the pictures instead of using a lighter, bottle, his arm, or even a yardstick to show the scale of the plant... he used a redhead, reaching over her head .
BtW, I've seen recommendations (in regards to watts per ft.²) for flowering with LEDs that gave a range of 25 to 50. The reason that a range was given instead of one number was due to the extreme variance in technology, power output, and penetration amongst all the various LEDs. With your panel having COBs of a fairly recent generation (just behind the 3970?), I am again guessing that the panel would perform well @ 38 watts per ft.², in a square space (that is enclosed by reflective walls) of just a fraction of an inch greater than 2½' on each side.
And, of course, I'll qualify all of the above with, "...depending on various factors such as strain choice, growing/training style (if any), and environment."
I got 3 females from 4 Regular Sensi Seeds Jack Herer
The Sativa version grew very tall very quickly
I had to raise the light to the very top of the tent, double wrapping the wires
Thanks, Mr Krip Here is an update, beginning from 11/08/16, a week after the last update.
I am liking this after almost 2 weeks in flower, but I feel that my Light is very far away...
They have a long way to grow; I may still lower the light, but I want to see how the lenses perform first.
Thanks, Mr Krip Here is an update, beginning from 11/08/16, a week after the last update.
This is the Sativa Jack Clone
These are the Indica Jack Clones - I only kept the fastest growing pheno, they were very similar otherwise.
The mostly-harvested Sativa is being left for a while to see if her nanners develop pollen for the early pistils
I am stripping the non-nannered buds off slowly, leaving only the ones with nanners...
These are the bottom popcorn buds on the Sativa Jack - No nanners here - Stripped.
In the Veg Shorty With Skush Clone and the 4 Jack Herer Clones - Stripped of leaves and their tower fan.
It was only moving left to right, but not blowing any air. They felt cheated, so I humiliated them as well ::
13/08/16 - Flower Tent again!
I am liking this after almost 2 weeks in flower, but I feel that my Light is very far away....
15/08/16 - 1st day of the Glass Lenses - Camera still on Automatic setting.
They were very easy to install and are solid glass.
The Jack in the corner of the tent is noticeably darker now!
There's a darkness on the edge of tent...
I just fed them today with some Calcium, Humic/Silicon, Fishmix and Bloombastic on 10 liters of water.
They have a long way to grow; I may still lower the light, but I want to see how the lenses perform first.
I have seen those house decor lamps that have a set of flexible mic stand material and different lights attached. Why not make a version that will allow you to do that with Cree cobs surrounded by a ring of blue/red/UV/IR 5W LEDs. I would love to have a hanging version and point the lights where they are needed. They could be made of a lighter material like aluminum or magnesium. Other ways to spread the light with cobs would be individual cob units that can be hung separately or a frame made of light metal that has cross pieces every foot to anchor the cobs and supplentary LEDs. This would be great if it could be made as a bolt together unit. Transport and storage would be a cinch. The frame would be great for a light mover. You could tie in fans easily or supplement the light. Damn this is exactly what I need to make. One big point light source will soon be last Gen.