I bought a Mars 300w with a good rep for 10k, a grow tent was B3,200, fans B400 ea. Then there's things like electrical leads, soil/grow media, pots etc. It's working fine so far, but there's no air con and temps are about 3 degrees hotter in the tent than outside.
Once upon a time the best cannabis was suited to hot climates, now it's cooler climates but there are strains available that can cope with the heat and the tent will be cooler that outside under the sun. Whether these strains are as strong as other varieties I don't know, but life's a compromise.
With more countries legalizing cannabis, I think there will be a move away from lights, mainly due to cost. One thing about the sun is nobody's paying for it, so nobody's paying for ads, articles and blog posts telling you how good it is.