Grow lights

[Doug]

Just wondering if anyone knows if LED's can be used to start seedlings like Tomatoes, Peppers and so on if so which colors would work best for this

[Rob]

Here's a good place to start:
http://forums.linear1.org/index.php/topic,419.0.html

[Doug]

I do have a few red but not too many blues but now at least I have something to work with, thanks alot

[Doug]

I was able to put one together and sent it out to a buddy of mine and he said it works well I'm going to see what kind of results he gets before I decide to build some for myself

[cadstarsucks]

an interesting link on aquarium lights .. http://www.sankey.ws/plantlumen.html
Dan

[BVnursery]

Doug...  you should take a look at page 2

http://forums.linear1.org/index.php/topic,1251.msg7050.html#new

[cadstarsucks]

For lettuce, at the very least, it is red:

http://www.metaefficient.com/archives/hydroponics/red-leds-to-grow-lettuce.html

I have been doing some reading and it seems red is probably best.  I go into it in the other topic with bvnursery where we have been discussing the HV discussion has shifted to the pros and cons of various LEDs as grow

lamps.http://forums.linear1.org/index.php/topic,1251.15.html

Dan

[Doug]

Red LED's are more afordable too in setups like this. The guy who I sent this to said it seems to be working out ok, he has a cutting from a plant and it seems to be doing well

[cadstarsucks]

Doug...  you should take a look at page 2

http://forums.linear1.org/index.php/topic,1251.msg7050.html#new

You guys got me on  a very deep tangent...

http://ncr101.montana.edu/Light1994Conf/Contents.htm

Dan

[BVnursery]

Not at all Dan....   the paper or series thereof is one of the most single source complete ones Ive seen.   Thanks for posting that !!!

[BVnursery]

Actually if you extrapolate from some of the spectral charts, it is a dead on mirror of the results of the research Ive done and have based the nm ratings of my arrays against.

Teckie enough for those that want it but broken down into segments so that if us folks can read it and find what our particular interest is.   Really well done.

[cadstarsucks]

Actually if you extrapolate from some of the spectral charts, it is a dead on mirror of the results of the research Ive done and have based the nm ratings of my arrays against.

Teckie enough for those that want it but broken down into segments so that if us folks can read it and find what our particular interest is.   Really well done.

I could not, off hand, find the link to it from the main page.  This would mean then it is considered "off line" and could be yanked at any moment.  Consequently I am considering mirroring it locally to prevent it's loss.  If and when I will forward it to you and Rob zipped as you seem to be the ones most interested, though it seems there might be one other.

Dan

[cadstarsucks]

Actually if you extrapolate from some of the spectral charts, it is a dead on mirror of the results of the research Ive done and have based the nm ratings of my arrays against.

Teckie enough for those that want it but broken down into segments so that if us folks can read it and find what our particular interest is.   Really well done.

Got it.  A 10M zip...  If you get daisy for FF I can DDC it to you

Dan

[BVnursery]

DDC I understand...the old mirc transfer....but Im lost with daisy and FF.   Im pretty sure gmail will accept an attachment of that size though.

Bob

[cadstarsucks]

Actually if you extrapolate from some of the spectral charts, it is a dead on mirror of the results of the research Ive done and have based the nm ratings of my arrays against.

Teckie enough for those that want it but broken down into segments so that if us folks can read it and find what our particular interest is.   Really well done.

BV,

From a production standpoint you should use lensed SMTs.  If, for example, you were to use a panasonic LNJ218C8ARA for the red and project the eye curve into the plant curve you get a peak of 612mcd at 660nm and 136mcd at 680nm.  I know mcd is scaled for the eye but it is easier to just call it that instead of introducing a new term to everyone who reads this.

Dan