CXA3590 Build Plan

Or with 25 cm sq / watt, I could go with a 8 foot heat sink but only 3 inches wide.
I like the heat sink in one piece for structure.

Doer said:

I also see the point if the temps are not too high to just let the A/C deal with it. Don't try to exhaust the air.


What could possibly go wrong?

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terrible back pressure in your fans....try to find with over 2 inches of back pressure...I bet this one hovers around 1, if lucky...

MS paint plz. I don't understand what's happening anymore.

Well, first....

Put the lime in the coconut and drink it all up
You put the lime in the coconut and drink it all up
You put the lime in the coconut and drink it all up

I'll try to put something together in sketchup.

Abiqua said:

terrible back pressure in your fans....try to find with over 2 inches of back pressure...I bet this one hovers around 1, if lucky...

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Back pressure? Like the fan suction? Good point. I had not thought of that.

Based on the latest estimates for active at 25 w/cm2, I price this heat sink.
It cost the same, has the .300 base, but is 2 feet longer for spread.

3.500" Wide Extruded Aluminum Heatsink
Choose Length (Inches): 72" = $82.80

What are the dimensions of the cannopy you're trying to light? A 6' hunk of aluminum seems excessive, shipping is going to be killer on that as well.

bicit said:

What are the dimensions of the canopy you're trying to light? A 6' hunk of aluminum seems excessive, shipping is going to be killer on that as well.

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It can be your excessive but not mine. The sink is only 3.5 inches wide. I am not trying to light a dimension of canopy. I've done all this in a tiny bathroom, but I will have a bedroom in the new house I just bought.

I am trying to make a high watt device, with good spread and good thermal characteristics, as simple as possible to build and maintain. And I want it to better than my 1000w HPS.

You were asking for a drawing?

Doer said:

It can be your excessive but not mine. The sink is only 3.5 inches wide. I am not trying to light a dimension of canopy. I've done all this in a tiny bathroom, but I will have a bedroom in the new house I just bought.

I am trying to make a high watt device, with good spread and good thermal characteristics, as simple as possible to build and maintain. And I want it to better than my 1000w HPS.

You were asking for a drawing?

View attachment 3368132

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Your build looks anything but simple. Quite the opposite actually, drilling and tapping a 6' sink is going to be a chore. It's going to be big, awkward, and heavy. Then you want 3 of these monstrosities!

You're money, use it how you want it. I just think you could get better results and simplify your build by going with smaller pieces. Though you seem to have gone into 'challenge accepted' mode at this point.

The reason I ask the dimensions of the space you plan to light is that you can easily bleach the plants with too much concentrated light. More than 55 w/ft^2 is pointless can actually cause plants stress or worse bleaching.

This device has a width spread of 56.5 inches at 36 inches, 115 degree cone.

And in 72 inch length it will have an additional 40 inches of spread, 20" on each end. COBs are inset 6 inches from ends.

So, the footprint at 3 feet distance is 56.5 x 112 = 6228 sq inch or 4.08257248 m^2.

900w x 40% = 360 PAR watts / 4.08257248 = 88w / sq meter

Total amount of sunshine (direct and indirect from the atmosphere) hitting the ground is around 1120 W/m2 (per wiki)

But, about 60% is not PAR.

In terms of energy, sunlight at the earth's surface is around 52 to 55 percent infrared (above 700 nm), 43 to 42 percent visible (400 to 700 nm), and 5 to 3 percent ultraviolet (below 400 nm).

So, 1120 x .4 = 448 PAR watts per meter sq. for Sunlight.

bicit said:

Your build looks anything but simple. Quite the opposite actually, drilling and tapping a 6' sink is going to be a chore. It's going to be big, awkward, and heavy. Then you want 3 of these monstrosities!

You're money, use it how you want it. I just think you could get better results and simplify your build by going with smaller pieces. Though you seem to have gone into 'challenge accepted' mode at this point.

The reason I ask the dimensions of the space you plan to light is that you can easily bleach the plants with too much concentrated light. More than 55 w/ft^2 is pointless can actually cause plants stress or worse bleaching.

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So, you say, but sunlight is 440 watts PAR. And it is 1120 total watts/meter sq. at the surface with 60% infrared and ultraviolet.

And to convert to metric there are 10.764 sq ft in a sq meter. 1120 / 10.764 = 104 watts of raw sun per /ft^2.

So, it is meaningless to say, 55 is some limit. Only 1/2 sun power.

So, 88w per w/m^2 / 10.764 = 8.17 watts per foot, for this rig.

But, that is PAR. Sunlight is 448 par / 10.764 = 41.63 w per square foot.

So, sure, diving it over 55 PAR watts per foot is asking for trouble. But I am at 8.

And BTW, Phase One, concept design is not "challenge accepted"

I am a trained planner for a living.

bicit said:

Your build looks anything but simple. Quite the opposite actually, drilling and tapping a 6' sink is going to be a chore. It's going to be big, awkward, and heavy. Then you want 3 of these monstrosities!

You're money, use it how you want it. I just think you could get better results and simplify your build by going with smaller pieces. Though you seem to have gone into 'challenge accepted' mode at this point.

The reason I ask the dimensions of the space you plan to light is that you can easily bleach the plants with too much concentrated light. More than 55 w/ft^2 is pointless can actually cause plants stress or worse bleaching.

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Drill and tapping the number of holes for the COBs has nothing to do with the length of the sink.

Besides I will make a clamped drilling template for the holes. That's how we do it uptown.

bicit said:

What are the dimensions of the cannopy you're trying to light? A 6' hunk of aluminum seems excessive, shipping is going to be killer on that as well.

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Shipping is $25.60 FedX

Shipping for 9 x
RCX-Z200
Rosewill fans from Amazon is free.
9 x = $124.11 + Free Shipping

The heat sink is 82.50 + 26.50 = $109

I can easily make the duct from 1/2 foam board double sided with mylar. Score parallel lines 6 inch apart the length of one side and leave the inside layer intact. Snap it into a square tube. Tape the edges. I can get 2 tubes per panel. So, $20 bucks a tube. And maybe 3 pounds each.

The sink weighs, 0.15 x 72 = 10 pounds.

So, I am not sure if you are really seeing this yet @bicit

The Rosewills weigh 1# each, and the wiring is a mess. I will have something that weighs under 20 pounds completely self contained.

This is all due to the efficiency gains in active horizontal, force air cooling.

36" above the canopy?! Why are you hanging it so high?

bicit said:

36" above the canopy?! Why are you hanging it so high?

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Man? Did I say above the canopy? No. I calculated fux density at 36" and you went all assumptive.

-_-

Have fun.....

Doer said:

Man? Did I say above the canopy? No. I calculated fux density at 36" and you went all assumptive.

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If you don't mind me asking, what is the point of calculating it at a distance if you are not going to be using it at such a distance?

thats what it will be marketed as...