Home Made LED Panels

[pan4gold49]

The photo spectrum:



Chlorophyll a, the most important light-absorbing pigment in plants, does not absorb light in the green part of the spectrum.

So as you can see:
Make up of an ideal led panel:
2% UVB Leds for resin and tric production. 380mn
6% Royal Blue Leds 455mn
12% Blue Leds 470mn
30% Red Leds 627mn
50% Far Red leds 660mn

Sunlight contains 4% ultraviolet radiation, 52% infrared radiation and 44% visible light.
I would stay away from amber leds I have seen I studies that show an increase in hermaphrodites.
I will go into Chlorophyll b when I can find the graphic again.

Pan4

[music4higher]

Mad scientist at work!!!! Go get em!!!

[McBudz]

Awesome picture.

[Need2FreeWeed]

I'm glued to this one... LEDs are the future I believe

[tainted]

Yeah, this is "green technology research and development project" I can believe in. Note to self, submit grant application immediately.

[pan4gold49]

For looking at this. I can't wait til the garden's finished so I can get back to the research. I have learned a lot and have more lab notes to share.

Pan4

[zolar]

isn't there an american made high output LED out there [cree?]

how do you figure out lumens on LEDs real world measurements
with light meter or quantum meter or from tech data sheets


how much $$ is tied up in matierals?

[pan4gold49]

Yes is a real mess trying to figure out just how much light is produced.
Most led data sheets have light measured in MCD or micro candles.
They also have the dispersion angle mixed in to the measurement. Since there is really no standard since the manufacturer measures this light output.

I am currently making my light meter so I can measure the light myself.

Yes I have some the Cree leds for testing 1w, 3w and a 5w.

I want to get back to the project but the time and money are in short supply.
After the garden is completed I will have some time. Only two projects left there.

Just to let you know this is not done yet.

Pan4

[swampgas]

Kudos pan4. If it weren't for those dedicated to doing research, we'd all be trying to grow under kerosene lanterns. Thanks for your willingness to experiment. Really interesting stuff.

[zolar]

anyone heard any thing new on this LED project hey pan4 are you going to suprise us by showing up at the baseball park in SF on opening day by committing stoner terrorism and stealing the wood bats and replacing them with monster LED grown colas... we wish

[mc_trump]

I believe that I have seen this grow now with out the LEDs check out the grow journals I think that this will work eventually but just not quite yet.
I do not think the frequencies are right unless you use white and then they are not getting enough light because they can not use it all.
But very much thanks to all the people willing to try

[pan4gold49]

Originally Posted by swampgas

Kudos pan4. If it weren't for those dedicated to doing research, we'd all be trying to grow under kerosene lanterns. Thanks for your willingness to experiment. Really interesting stuff.

Yes I want to get back to this I have 500 red/blue leds, 3w leds, and some 1w. I need more.

Originally Posted by zolar

anyone heard any thing new on this LED project hey pan4 are you going to suprise us by showing up at the baseball park in SF on opening day by committing stoner terrorism and stealing the wood bats and replacing them with monster LED grown colas... we wish

So do I

Originally Posted by mc_trump

I believe that I have seen this grow now with out the LEDs check out the grow journals I think that this will work eventually but just not quite yet.
I do not think the frequencies are right unless you use white and then they are not getting enough light because they can not use it all.
But very much thanks to all the people willing to try

Thanks mc_trump
I have also looked at white led arrays 25w very spendy . My money is leaning towards RGB leds and modulating the frequency to produce what ever color is needed. Even sunrise and sunset.

Pan4

[mc_trump]

that sounds great but I doubt that you could do that right now and spend less than 10,000 dollars but maybe down the road I am not willing to spend that much.
So it sounds like they have the technology now they just need cost control LOL

[sfhaze]

Originally Posted by pan4gold49

The photo spectrum:

So as you can see:
Make up of an ideal led panel:
2% UVB Leds for resin and tric production. 380mn
6% Royal Blue Leds 455mn
12% Blue Leds 470mn
30% Red Leds 627mn
50% Far Red leds 660mn

Pan4

To much far red, the plants use red/far red ratio to determine if they are under the canopy. Sunlight has way more red then far red, but most of the red is absorbed by the plants so underneath far red dominates. Also, there are helper molecules that allow chlorophyll a to respond to a wider range of reds in while in the plant.

I don't know about UVB, hid lights have none of it. It may not be necessary.

[pan4gold49]

Originally Posted by sfhaze

To much far red, the plants use red/far red ratio to determine if they are under the canopy. Sunlight has way more red then far red, but most of the red is absorbed by the plants so underneath far red dominates. Also, there are helper molecules that allow chlorophyll a to respond to a wider range of reds in while in the plant.

I don't know about UVB, hid lights have none of it. It may not be necessary.

The mix of leds is based on.
A sunlight
B intensity of leds

Example
So to get 1 par @ 660nm I need 8 leds of that type
but @ 627mn I need 2 leds for 1 par
@ 470mn 1 led is 2 par

My Hid has uvb if not I would add some. UVB causes increased resin production from a protection mechanism by the plant.

Pan4