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It should look like a wall of green, like ivy growing on a granite wall.

The enclosure's walls are acting like a 90° reflector, substantially increasing efficiency. Remember, a true SoG is only defoliated because of the density and low height.

The 4x4 suffers because of angular radiance, even the walls will have a difficult time reaching the corners. Instead of having 8" of lateral growth we would have 15" which would be better, but it would present a problem on the sides. We could add a tube to make eight to compensate, but at that...

This is true. Getting the light in there is the problem. Now, if we used hexagonal or octagonal shape in the middle with EBs it would be very possible and very costly. Keep in mind the enclosure. The walls and ceiling are reflectors. This gives us a usable foot-print of about 3.5' at 12"...

Lighting distance. The angular radiation from the chips limit the usable footprint. Most COBs, I've seen, have an actual radiance of about 160° (10%) with a usable 120° (50%), under 120° things start becoming intense. The harder you drive to meet the corners the center will get twice as much...

EBs under the canopy running the length from top to bottom, or scattered, would be a huge advantage.

Ok, let's keep things simple. In theory, twenty zips from a 3.5' x 4' double-sided would make the overall yield forty. Two and a half pounds isn't far from my estimation of three. I think I'm finally on to something here.. Thanks for your input @Rahz !!! Aside: it would be an aeroponics...

There is no screen.

Just an estimation based on so many people getting 2 g/W of COB. 140W x 2 = 280 280 / 28 = 10 Eight ounces makes it a conservative estimation, SoG should make it a reality. Some places care about stems, others are smart and care about dried weight. My plan is high efficiency, from all angles.

The latest 1825 and 3618. From what I've seen, I wasn't impressed by the numbers and given the constraint of passively cooling only, I made bed with Bridgelux. If I am wrong, I want to know. My goal is to do the very most with the very least to keep power consumption, space and cost to a...

What are the prices on those chips? @CobKits

I sent you not-to-scale sketches. I tried to communicate how a RDWC system works and its advantages to another member, it had to be five paragraphs. :leaf:

I think the Dual-VSoG is realistic with today's technology. What do you think the yield would be with that area and light concentration? @Rahz

I ran some trig and found for the lighting source it would be more realistic to use a 3' x 3' space because of the angular radiance. Still, I think with LED it would be possible to pull three pounds. The problem I'm running into is not getting enough light with out adding side lights. The 4' x...

From what I saw for sale, I could get two Vero29C chips for the price of one Citizen 1825 and three for the price of the 3618. That means two or three passively cooled COBs spreading out light at a much higher efficacy because the drive current and heat will be much lower.

Blame DigiKey for those sheets. I pulled what they had for sale on their shelf and pulled the sheets that matched those. There is headroom for the Vero29, still. The efficiency isn't that great though, even though they are listed to run higher I bet there will be runaway heat problems...

What about a two-sided VSoG? 112 sites, aeroponics, low pressure. At one ounce per clone that would be seven pounds, at a half ounce per clone that is three and a half pounds. This would fit inside of a 4' x 4' tent to use the walls. Your thoughts? Besides plant count. @ttystikk

EB shelves.

@Rahz Why use a lower CRI when we could simply go higher on the Kelvin scale and choose an emitter that gives the wavelengths we want? Is there an upper limit to CRI and PPFD? In other words, is there a point where CRI inhibits PPFD?

Never, although I have read there are several studies that support that theory. It would be a good idea to play with that after you have everything else dialed in.