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Originally posted by AndyL tomato growing...
You don't want full spectrum, you want red. Red is what's photosynthesized, blue is also kinda used - but to provide directionality not actual photosynthesis.
Everything I've read doesn't recommend single light sources for pretty much any plants. Same goes with tomatoes a few LED research papers out there calling for mixed light specifically white, blue along side with red. Not sure why you would just not get a broad spectrum lamp and then not have to worry you don't have the correct light profile.
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Most of the commercial grow lights now are pure red and a little blue. If it's supplemental to daylight - then it's semi irrelevant there's some great NASA docs on it - the 660nm red and 450nm blue grows were developed on the shuttle missions