> yes, but you are spending money and carbon on re-creating sunlight.

Unlike farming in Africa and shipping it around the world? Vertical farming allow to farm specifically where it is needed.

What about freezing it to allow to get it all year long?

> What agriculture really needs is an effective way to make and keep decent soil.

Then go for it, see you in next year YC. If that really what it need then you won't have trouble selling it.