TIL that lettuce can grow with artificial sunlight (specifically red/blue LED lights)
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Why Cleveland’s Sky Has a Purple Glow (Sometimes) – Now I Know
https://nowiknow.com/why-clevelands-sky-has-a-purple-glow-sometimes/
As Cary Mitchell, a horticulturist at Purdue University told NPR, in the 1990s, “research showed that you could grow lettuce in just red light. If you add a little bit of blue, it grows better.”