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Yet Another DIY LED thread

Hotpeppa said:
how do you know what ratio of red vs blue leds to use ?
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No one is quite sure which is why everyone is still "experimenting".

However you can kinda guestimate based on what you're trying to accomplish:

More blue for vegetative growth, less stretching/shorter internodal spacing

More red for flowering/fruiting
 
14 watts likely will not deliver enough light intensity for blooming/fruiting, especially as the plant gets larger. They do work well for seedlings, though. I was going to use them but couldn't afford all the panels I would need to cover the area.

Mike
 
wordwiz said:
14 watts likely will not deliver enough light intensity for blooming/fruiting, especially as the plant gets larger. They do work well for seedlings, though. I was going to use them but couldn't afford all the panels I would need to cover the area.

Mike
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im not to sure about that i use about 15 watts for my to boards and the big plants are realy comeing on and have set fruit so i think it can be done will need to see how big the fruit gets before i can say any thing more but you can get very good growth from leds any way for bring them on ect
 
Hotpeppa said:
how do you know what ratio of red vs blue leds to use ?
Click to expand...

I read somewhere around here on the forums that a 2:1 ratio red/blue should be a good ratio. I got there naturally because of the specs of the LEDs, giving clusters of 10 reds and 6 blues on my 20V PSU.


wordwiz said:
14 watts likely will not deliver enough light intensity for blooming/fruiting, especially as the plant gets larger. They do work well for seedlings, though. I was going to use them but couldn't afford all the panels I would need to cover the area.

Mike
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Well, that is one of the things I'm going to experiment with. 14W may not be that much, but remember that it's only used to power the lightwaves you need. Looking directly into the light is VERY unpleasant. The brightness is intense!
 
BillyIdle said:
Well, that is one of the things I'm going to experiment with. 14W may not be that much, but remember that it's only used to power the lightwaves you need. Looking directly into the light is VERY unpleasant. The brightness is intense!
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I know, I have two 14 watt panels of Red/Blue, one all red, one all blue and a 45 watt red/blue panel. It's not bad looking at the lights at an angle but straight on - yep, I see dots for a couple of minutes!

Mike
 
I wish you the best with this project :)

I'm considering building a small but very intense light using some of these:
http://ca.mouser.com/Search/ProductDetail.aspx?qs=LS9G2jNu8qYHCEbLSFvWGA==
http://ca.mouser.com/Search/ProductDetail.aspx?qs=Eu63EZxBwKJVHS22O9bdUQ==

And try to grow a single plant under it. Get's a little pricey though, but I love to experiment. It seems one of these led's is worth 4 of the 5w led's and save you a few dollars.

Now I just have to figure out how to write it off as a biz expense. hahaha
 
lostmind said:
I wish you the best with this project :)

I'm considering building a small but very intense light using some of these:
http://ca.mouser.com/Search/ProductDetail.aspx?qs=LS9G2jNu8qYHCEbLSFvWGA==
http://ca.mouser.com/Search/ProductDetail.aspx?qs=Eu63EZxBwKJVHS22O9bdUQ==

And try to grow a single plant under it. Get's a little pricey though, but I love to experiment. It seems one of these led's is worth 4 of the 5w led's and save you a few dollars.

Now I just have to figure out how to write it off as a biz expense. hahaha
Click to expand...

The only problem you have to cope with here is heat. All those high effect LEDs must be mounted on some sort of cooler. Using a PC heatsink might do the job though.
 
I run a website hosting company, so I have a lot of spare cpu heatsinks lying around. I'm thinking I can come up with a method to reuse them and a PC power supply to run a light.
 
lostmind said:
Too bad they don't give you more specs on those. It looks like 25 rows of 12 1Watt led's?
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If you follow the first link in the text, you get to the shop, and there they have full specs. Your assumption is absolutely correct.
 
Ahh I see it.

17 lumens per blue led and 45 per red I think? so ( 32 x 17 ) x ( 256 x 45 ) = 12,064 lumens output? cool... now someone do the math to figure out how that corresponds to photosynthesis and efficiency and all the crap I don't understand :)
 
lostmind said:
Ahh I see it.

17 lumens per blue led and 45 per red I think? so ( 32 x 17 ) x ( 256 x 45 ) = 12,064 lumens output? cool... now someone do the math to figure out how that corresponds to photosynthesis and efficiency and all the crap I don't understand :)
Click to expand...

I don't know that math either, but according to the table on their page, the 300W light (which actually is 288W) is enough to cover an area of 5x2.6m, or 13 sq. m. (140 sq. ft.), when mounted at 1,5m (5') height! Me wanna have!
 
Seems like serious products. 300W LED is a lot, but it's hard to compare the two technologies. Yet. Guess there will be a lot of research on LED grow lights in coming years, and maybe someone will come up with a conversion rate between HID ligth and LEDs.
 
lostmind said:
Ahh I see it.

17 lumens per blue led and 45 per red I think? so ( 32 x 17 ) x ( 256 x 45 ) = 12,064 lumens output? cool... now someone do the math to figure out how that corresponds to photosynthesis and efficiency and all the crap I don't understand :)
Click to expand...

i dont know how they come up with that figure so its a 300w led board and it gives out 12,064 lumen out put that seems to me rather low for the power you are puting in is that right any one got a link to the 300w pannel ?
 
Gary18 said:
i dont know how they come up with that figure so its a 300w led board and it gives out 12,064 lumen out put that seems to me rather low for the power you are puting in is that right any one got a link to the 300w pannel ?
Click to expand...

And that's why I don't think that calculator is accurate and/or the specs for your LEDs are correct.
 
well if you look at the light they give out to the human eye they are blinding but the spec of my leds are on the packs they came in so i have no reason to not beleve them but how knows also the lumen caluclator is a ligit site too so how knows 300 watts for leds is crazy in my opionion because its a very small area of light you would be aswell geting some cfls
 
Should have had a little more cash than I have atm., cause then I could order the LEDs you use, and compare to those I have now :) According to the calcluations you did on my LEDs earlier in this thread, my new layout will output 210 lumens, while yours was 50000+. Thats in the 250x brighter ballpark, even though you have 96 LEDs compared to my 224. My consumes 14W, while yours uses 48W according to the specs. Something's not right here. That said, those you use are still much brighter per LED than mine.
 
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