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Having it closed (like this server rack) allows for controlled air circulation if fans are installed and flow paths are designed properly. Also, in case heating is needed, for example, if operated in the basement the heat loss can be reduced.
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Tell me more about super spinach. B12 doesn't come from plants or animals, but from bacteria. So, I don't know how you could get B12 into spinach by using red lights. You'd also need to introduce the bacteria and somehow make it live inside of the spinach.

Do you have some sort of inoculation step and then use red light to penetrate the spinach leaves to feed light energy to the bacteria?

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Op did mention that that it's impossible to get the rack out because they installed the doors after the rolled the rack cabinet in
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It's obviously not impossible, just need to take it apart.
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Or pry the door frame apart and tap it back in place after rolling the rack out.

Worth a mention as many door frames are easier to remove than a number of people might suspect .. fewer pieces to disassemble than many {object}'s and not an uncommon hack when moving furniture.

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Removing door frames is easy. Putting it back together without looking like crap is the hard part.
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Repeat after me: caulk and paint make it what it ain't
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For the one I have that would be irreversible. You‘d have to cut it up.
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