I see something wrong with your math.........what is the value of the labor to build 80 lights? WHO is going to build them, you?? There is no way this is a one man op, so you'd need to pay people to build them. How much will that cost? sure as hell you don't want someone hired at minimum wage doing it!
then each one has to be tested and corrections/repairs/improvements made until every unit. You don't build anything from scratch without expecting to spend a little R&D time on them! This could end up costing you more than buying top shelf comercial LED lights.
then you have the problem of people with no electronics skills trying to build a device that will be reliable. and there WILL be fuck-ups with this scenario! Sounds to me like you think you'll just buy a bunch of parts and bang them together.
As a former business owner, it sure sounds to me like you haven't done your homework. I haven't even scratched the surface of the complications of this! Here's another one for you:
Electrical inspection. do you think they will pass inspection? are they going to be UL tested? If not, and they somehow manage to pass the code inspection without it ( HIGHLY unlikely ), what happens if one catches fire and burns down your op? I'm willing to bet the insurance company would screw you for having DIY lights.
Again, don't get me wrong, I love DIY lights and I know they can be very effective. But considering what a grow-op this size is worth, it would be foolish IMO, to waste time and risk your business doing this!
Start thinking like a business owner, not a hobbyist looking for a headstash!
3 fruiting rooms, a total of 80 4' by 4' grow pods. that includes our 2 R&D rooms. We build for 1000 vs paying 3000. get a better product. 80 * 3000 = 240,000. 80 * 1000 = 80,000. 240,000 - 80,000 = 160,000. Now I know that we would get a huge discount but the product is big enough and doesn't have the spectrum of light I want.