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[APD] APD] LED lighting --a wrench in the gears....

Gomer / tony - you're over-analyzing!

NASA's shuttle grow booth uses only 670nm and 470nm (I think I read it was a 4red:1blue ratio) for their growth experiments. While we know it would be GREAT (or maybe not so) if a LED could put out exactly 670nm - in practice there's a nice curve when you look at the specific wavelengths put out by each led - so while 664 and 662 are the 2 major chlorophyll peaks - chances are a 670 or so LED is going to encompas both (probably less for chlorophyll B)

If one was going for a PURELY grow lighting - then yes you'd probably want to hit those peaks with specific LEDs to those wavelengths. But as we generally have fish in our tanks, I think their needs become our priority - thus we use at least some white light - to give them some sense of normality. Between the White LEDs and in my case the reds - those wavelengths must get hit well enough to cause pearling.

Pictures - yes as soon as my digital camera gets repaired or replaced. I'll see if I can get something visible with the webcam (so far its managed to get a blue-white glow - and thats it)


Date: Mon, 05 Jan 2004 15:22:28 -0800
From: "Gomer Gomer" <iegomer at hotmail_com>
Subject: [APD] LED lighting --a wrench in the gears....
To: aquatic-plants at actwin_com

A couple things to consider. If you are looking for growth and not just
lighting a tank (which I think we all want)...then just any ol red or blue
won't cut it. Chlorophyll A and B both have absorbtion bands that are not
easily matched with LEDs (or atleast the ones I can find). Also, you NEED
blue for more than just growth. Blue is what the plant uses to in order to
know what direction to grow.


..everything else is wasted as far as growth is concerned.


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