Illumination, required for photosynthesis.

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What are the alternatives to AeroGarden

I'm looking for an indoor hydroponic system and I've found the AeroGarden family which looks great but I'd like to check the alternatives. Are there systems similar to this? Important features for me: ...
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Photometry and plant growth

What unit of photometry is used to assess plant growth? Is there a catalog that lists plants and the required light exposure? I'm looking at more detailed indicators than "a lot of light" or "not too ...