LED growing- An instructional grow log

Another interesting aspect of growing with LED's is pulsing them. Photosynthesis actually can occur at 100% with LED's being pulsed anywhere from 0-100 nanoseconds, longer pulses than this reduces photosynthetic effect. So by doing this we can save energy as pulsing the LED's for 100us on and 900us off would only have a 10% duty cycle so 1/10th of the total energy would be required compared to constant lighting. https://mywebspace.wisc.edu/tsharkey...ght%201995.pdf
look at the top left corner of page 266 for a detailed graph

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Originally Posted by physicsnole

The way I was going to control the different colors and mixing programs was with a microcontroller. With a microcontroller you could have set certain output pins (there are 28 in mine and each output pin can be a series of LED's) that control the changing colors (changing voltage) on a set time frame, like a calender.

And why did you choose 10mm LED's? I found 5mm LED's to be pretty much the same brightness, however since 5mm are smaller you could have twice the LED's compared to 10mm. Just wondering. Also are you using drivers for the LED's?

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It's just my opinion, Feel the 10mm cover's slightly more, I can feed a little higher voltage @ and still cover lower as well.
Inverter's--to A PC. This is ONLY a test. Hope You Best of Luck with your project!!! Later

OK, so in your guys' humble or not so humble opinion, exactly what nanometers are needed for a proper LED array? Blue, far blue, red, far red, green, white, and yellow. I know you don't think we need the last three, but if somehow you were forced to use them in your hypothetical array, what nm exactly would you use? If cost didn't matter.

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Originally Posted by Opie Yutts

OK, so in your guys' humble or not so humble opinion, exactly what nanometers are needed for a proper LED array? Blue, far blue, red, far red, green, white, and yellow. I know you don't think we need the last three, but if somehow you were forced to use them in your hypothetical array, what nm exactly would you use? If cost didn't matter.

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Well every color has some effect on the growth of plants. 470nm and 640nm are essentials. 420nm and 660 nm are also important, but not necessary. 730nm (IR) can be used for flowering and shorter night cycles (read my previous post about this). UV-B would also be a great addition for resin production. I have read that green and yellow colors also have photosynthetic benefits.

So I would have UV-B, 420nm, 470nm, 570nm, 615nm, 640nm, 660nm, and730nm. I would leave out white UNLESS you wanted to gain additional lumens lost by the other colors.

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Originally Posted by Opie Yutts

OK, so in your guys' humble or not so humble opinion, exactly what nanometers are needed for a proper LED array? Blue, far blue, red, far red, green, white, and yellow. I know you don't think we need the last three, but if somehow you were forced to use them in your hypothetical array, what nm exactly would you use? If cost didn't matter.

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I'm not going to repeat-myself! All your answer's are in previous post. Later

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Originally Posted by hatch

I'm not going to repeat-myself! All your answer's are in previous post. Later

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I don't know what I'm missing. There is no mention of the nm # I requested in your previous post. I started thinking you might have meant any of your previous posts and not your last one, so I went back to page 1 and went through all 11 pages looking for your answer. No luck. Lil help?

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Originally Posted by Opie Yutts

so I went back to page 1 and went through all 11 pages looking for your answer. No luck.

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ya I just did the same thing. eyes are watering now...

if cost were no issue, id love to get some 660s...other than that, id say physicsnole got it down....
:smokebong:
whiskeytango

think you need to hit a few more bowls hatch. i do an awful lot of reapeating in here, and dont bitch really.:thumbsup:...it happens

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Originally Posted by SnSstealth

if cost were no issue, id love to get some 660s...other than that, id say physicsnole got it down....
:smokebong:
whiskeytango

think you need to hit a few more bowls hatch. i do an awful lot of reapeating in here, and dont bitch really.:thumbsup:...it happens

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I was al-ready taking more bong-hit's!! Thanks,

Hey not bitch'n,, Just that we had already covered the nm. I think we get a small 200nm to 270nm ultra-v-white-clear,blue-green 330nm to 550nm, 555nm to 635nm green,yellow,orange, 640nm to 700nm orange-red,I-red. Later

hey stealth-
im curious how this grow will result, but to b honest, all these specs are kinda blinding.
i'll just be watching from over here and let all you techno-lite-geeksters sort it out.
Rock.:thumbsup: