Quote:
Originally Posted by biscuitridge
What kinda problems did you have with the shop lights?
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Tomatoes turned purple and got edema. Peppers were just stunted.
There's another thread here where I did some searches about that problem, and the science described the same thing and explained it. Absence of far red and blue frequencies can have weird effects on tomatoes.
Here I found it. Good discussion involving people trying out different lights. I was pretty happy with the greens under 4000K LED shoplight earlier in the thread.. Then I put tomato seedlings under them:
http://www.tomatoville.com/showthrea...t=46760&page=4
Not all of the old links work, but basic info about "intumescence" (same as edema but different cause) "
While edema is considered to be the result of an imbalance in water relations within a plant, intumescence is associated with low ultraviolet-B (UVB) radiation."
https://ag.umass.edu/greenhouse-flor...a-intumescence
And this research:
"https://www.canr.msu.edu/news/does_light_quality_impact_the_development_of_edema "
Note that my shoplight is 4000K, others had good results with LED 6500 K. The safe way to go is to get a light designed to provide broader spectrum. But blue light/UV end is most important (afaict more important than the far red) for tomatoes and other plants sensitive to lack of the blues.