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 Post subject: LED for seedlings?
PostPosted: Thu Mar 17, 2011 5:31 pm 
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Location: New York
Anyone try or use LED for grow lights?

I've been reading alot about LED grow lights, but I still have a few questions, go figure! :)
I only want to grow seedlings for my outside garden. I'm not planning on growing tall, leafy, mature, fruit baring plants inside.

From what I've read, blue light is for growing, red is for flowering/fruit baring. For seedlings, I should concentrate of getting a blue LED fixture, or should I get the red/blue mix?

Also, from what I've read here, the longer I plan on growing a plant, (tall, leafy, mature, fruit baring) the better the fixture, hence, more expensive. But as I said, I'm just growing seedlings, can I get away with a cheaper fixture? I can get a 14w, 135 red 660nm, 30 blue 30nm, 30 orange 610nm, 30 white full spectrum (or so they say).

What do you think?

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 Post subject: Re: LED for seedlings?
PostPosted: Fri Mar 18, 2011 9:49 am 
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I believe LED are the future for almost all lighting.

I am not yet convinced that cost has made it fully economical yet compared to T8 floro's or even T5 floros. LEDs do not yet provide the needed "throw" to penetrate the canopy as HID lights do.

I am watching a couple long throw LED "bulbs" that incorporate multiple LEDs into a standard bulb-sized enclosure. They run about $80 each and it appears three of them could cover 4 sq feet. That would equate to $240, plus an additional 10-15 for rigging the individual bulbs into a fixture. Now we are in the price range of an HPS, but I am still skeptical of the "throw" especially if dealing with 3 feet plus. The LED would win hands down on operating expense, but without canopy penetration why?

There is so much LED advertising saturation that it is a nightmare to find solid information on effects let alone vendors. :shock:

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 Post subject: Re: LED for seedlings?
PostPosted: Mon Mar 21, 2011 7:03 pm 
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Because I make many mistakes I say:
Being from New York you probably don't have a whole lot of time before you would need to have them up and running the way that you would like. If you got the blue and it was not what you needed then you would end up possibly missing out on your seed starts this year. And we would hate to see that happen. If you went with both red and blue and it was unnecessary then you might have extra lights that are just not good for what you need them to do. If you could get a smaller set and give it go during the season then you would have a better idea as to what you need for next year. The other issue is with all electronics pricing drops when it becomes more main stream so that would be an advantage to holding off. I am also not sure as to how long they last like other bulbs lose their whatever after 6 months to year.

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 Post subject: Re: LED for seedlings?
PostPosted: Sat Apr 02, 2011 9:18 pm 
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Location: New York
I'm going with Phillips T12 bulbs, 40w, 6500K. They're a bit 'bluer'.


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 Post subject: Re: LED for seedlings?
PostPosted: Mon May 02, 2011 8:44 pm 
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Nice setup Nifty!

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 Post subject: Re: LED for seedlings?
PostPosted: Thu May 05, 2011 4:47 pm 
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I like it too!

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 Post subject: Re: LED for seedlings?
PostPosted: Wed May 11, 2011 3:33 pm 
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Location: Alaska
Very nice set up. I like the adjustable chain.
T-12, eh.
Are the bulbs made for plants?
I may get one of those fixtures. I'll look next time at the box store.
Bulb type selection may be slim here.
Nice pic.
Thanks

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 Post subject: Re: LED for seedlings?
PostPosted: Thu Jun 16, 2011 9:07 pm 
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Various wavelengths of light on plants

Wavelength of visible light (4 * 10-7m ---- 7 * 10-7m)

Wavelength of light color ---------- λ (nm )---------- on behalf of the wavelength

Red ----- 780~630 ---------- 700

Orange -- 630~600 ---------- 620

Yellow --- 600~570 ---------- 580

Green --- 570~500 ---------- 550

Cyan ----- 500~470 ---------- 500

Blue ------ 470~420 ---------- 470

Violet ----- 420~380 ---------- 420

the spectral range of plant physiology
280 ~ 315nm: morphological and physiological processes of the minimal impact
315 ~ 400nm: Chlorophyll absorbs less impact on photoperiod effects, to prevent the stem elongation
400 ~ 520nm (Blue): the proportion of chlorophyll and carotenoid absorption maximum, the greatest impact on photosynthesis
520 ~ 610nm (Green): the absorption rate is not high pigment
610 ~ 720nm (red): chlorophyll absorption is low, and photoperiod effects on photosynthesis has a significant influence
720 ~ 1000nm: absorption rate, to stimulate the cells to extend and affect flowering and seed germination
> 1000nm: converted into heat


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 Post subject: Re: LED for seedlings?
PostPosted: Wed Jul 06, 2011 11:41 pm 
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Are you saying that blue light has the best wavelength for plant growth, Crarege? I'm not sure that I fully understanding the geek speak of the table you've posted.

Thanks!

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 Post subject: Re: LED for seedlings?
PostPosted: Wed Aug 24, 2011 1:23 am 
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In short, about 400 ~ 720nm wavelength of light helps to photosynthesis.
accordance with the above principles, plant growth lights are basically made in three forms, include red and blue, all blue and all red, covering the wavelength range for requirement of photosynthesis.


Last edited by Crarege on Wed Aug 24, 2011 1:25 am, edited 1 time in total.

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 Post subject: Re: LED for seedlings?
PostPosted: Wed Aug 24, 2011 1:24 am 
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love2garden wrote:
Are you saying that blue light has the best wavelength for plant growth, Crarege? I'm not sure that I fully understanding the geek speak of the table you've posted.

Thanks!


Both blue and red light has the best wavelength for plant growth
:oops: I am sorry for my English!!


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 Post subject: Re: LED for seedlings?
PostPosted: Thu Sep 01, 2011 9:12 am 
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Hi, sorry I haven't been on for a bit.

I've read that "red" light is for flowering, and "blue" is for leaf development. The T12's I'm using are Phillips 5600. In my HD store, they show a chart with the light spectrum, 5600 is thier 'blue-ist".

Everything grew quite well. All the plants were VERY green and healthy!

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 Post subject: Re: LED for seedlings?
PostPosted: Fri Feb 24, 2012 1:41 am 
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If you could get a smaller set and give it go during the season then you would have a better idea as to what you need for next year. The other issue is with all electronics pricing drops when it becomes more main stream so that would be an advantage to holding off.

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