I go raw, I trust my instance to defederate from the worst of it, but otherwise I don't block people, communities or anything. I also browse by all and while I subscribe to communities it's more for the future or something, because for now there's just not enough content to curate my feed really.
It's all good though because I switched to other sources for my specialist content (mainly YouTube) and Lemmy is just there for my obsessive scrolling.
I think these types of greenhouses typically also use sunlight through the the roof/walls like a normal greenhouse and the artificial lights are only in supplement so they can control the amount/duration of light year round.