LED experiment

C

Craig Degruyter

New Member
Hi All, I have a small ebb and flow setup which I used to hang 4 hps lamps above, but decided to experiment with LED .
SO I made this board 2.5m x 1m packed with red and blue leds plus 6500k white LEDs (all strip lights).
It's 700w it total. Of the Red/Blue strips I have 2 types (1 has 5 reds the other 3 reds to each blue).
There are 20 strips in total that I could turn on and off individually.

For my first attempt, I gave it FULL BLAST! lol... My plants started off awesome, really thick and luscious.... However as the grew, they looked like they were getting chemical burn, but I know it wasn't. They new growth was small and smaller leaves, but thick strong stems... Very strange growth.

I believe I have the spectrum wrong or something like that.
Is there any type of device I can buy to read the light spectrum I'm emitting?

Or advice to my experiment?
 
Smaller leaves could very well be too much blue.
You can google blue light response.
The blue ratio in your red-blue lights is about 25% (1/4 average) compared to about 12% in warm white. And then 6500k on top of that.
A better version would be strips which are completely red and completely blue on separate dimming.
 
A lux meter and a spectrometer is quite different in function and price. If you have a link to a cheap spectrometer it would be lovely if you could share. Ive not seen anything less than 600-700$
 
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