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Interesting economic point about stolen power and stolen labour, I am not entirely confident in your assertion that LED lights in a wardrobe can’t be beaten for efficiency however.
I also suspect that the distribution logistics would be lower cost for a legal operation.
Dammit-
You have to remember that it's only the crop, and not the method, that's illegal (in this country): advances in technology and technique made by legal farmers are freely available to the illegal one. And the Netherlands is a world leader in growing under artificial conditions...
The growing process can be largely automated, requiring only a low level of monitoring and maintenance, so whilst a professional operation will be more disciplined than a "hobby" grow, I can't see much room for improvement.
The cost of distribution was slashed some years ago, with the shift from hashish being smuggled from Afghanistan and North Africa to domestically produced "herbal" cannabis. So distribution costs now amount to a couple of heavies in a Range Rover. :)
A significant cost to any legal industry is likely to be security. If growing illegally is no longer profitable, then those heavies in the Range will just hijack the legal crop.
Scilly.Suffolk
A lot of the cannabis sold in the UK is already farmed "industrially", using the same tech as commercial growers of legitimate crops.
So it's already efficient and any economies of scale, would be dwarfed by actually having to pay for electricity and no longer being able to use enslaved illegal immigrants etc.