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No. You don't really need fancy lights, as fungi don't use photosynthesis. For yield, you want to look at 'bulk substrate' (read about that on the shroomery). Basically, you want to use horse shit or compost.
In practice, people put a few pounds of rye or wild bird seed in a big "mycobag", inject the bag w/ 10-20cc of live culture (living mycelium, a stage after the spores germinate) into it and then when it's all colonized mix it with horse shit and straw on a tray (casing).
Cakes yield about 1-5g DRY per cake. If you case the cake by crumbling it up and mixing it with horse shit you'll get a lot more, maybe 10-30g dry off each cake.
You can use as little as .25cc of syringe solution per cake (each syringe is 10cc). No you don't have to keep buying spores. You can use the mushrooms you harvest to get more spores by making spore prints from them, or better yet by cloning them.
Cloning is easy, you just take a piece of the stem of a living mushroom and drop it into a jar of grain and it will start colonizing from that. Practically you don't "drop" it but you suck a piece into a syringe (clean!) and then inject the piece into the jar.
Liquid culture also extends your syringe. That's basically growing mycelium in liquid and then injecting that into your jars. You can get a quart jar of honey + water, inject .25cc of spores into it and in 1-2 weeks you have a quart jar of mycelium which you can store in the fridge for up to 8 months. You can make A LOT of syringes from this jar and keep the cycle going by using the spores you harvest to make liquid mycelium.
As long as you get a few fresh healthy mushrooms from your first syringe, you have an infinite # of options.
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