@damien50 said it... covering a 4x4 is indeed expensive, even with DIY. I started with a 4 cob setup that was 200w. Cost me almost 300 and covered one corner of the tent. Then after a few runs I added an additional 250w. All together there is 450w costing 700$ in DIY to cover the 16sq ft. Works great for autos, it is marginal for photos. Needs another 150w to do photos well, all the way to the edges.
While 700 is a fair bite at the wallet, in 2 chunks it wasn't so bad, and am confident that my light is better than what I could have bought for the equivalent price. There are still lots of better lights... I'd love to be running the hlg 600 v2.... or like I said a while back the grow mau5e ChilLed lights would be a major upgrade.
Ran HPS/MH for a long time, watching growers struggle with the poor led lights on the market... led has come a very long way, it is unfortunate, but there are people that are just waiting for the "new growers" to come along to sell their poor performance lighting too... you've never seen a harvest under good conditions, so you won't know better... and when you only get 200 grams off 4 plants in a 4x4 (less than half what should come out of 16 sqft. I average right around 550 grams per run of marketable buds and feel I'm low about 200 grams per run) you won't know where to start to get the weight up... was it the nutes? The medium?
I have a hundred dollar tent that's lasted now 5 years.
I have an old 6" exhaust fan that was a cheap one... it still works.
There are lots of places to cut corners...
Lighting needs to be the best you can do.
When I was looking at all this, I got on YouTube and watched reviews for days. I noticed many reviews showed fantastic results thru veg, but never showed late flower or the harvest results... that is a red flag to me.
I may be a bit more selective in bud, have been 30 miles outside San Francisco for the majority of the last 50 years. I expect better weed than I can buy, and that means ticking all the boxes. Smell, potency, bag appeal.
Power here is outrageous, .29cents a Kw. That has made me a bit sensitive to lighting costs... I need best bang for bucks. Cheap lighting could actually end up driving the final cost per gram UP.
Am gonna go smoke now and slow my roll a bit.... sorry bout the long windedness!