For my particular light, I'm running
four 70 volt Bridgelux Vero 29's at 26 dollars a piece.
2 Meanwell Drivers (drives 2 cobs each) 120 bucks.
4 Large heat sinks, about 90 dollars
and I am building the frame myself from angled aluminum about 25 dollars in parts.
So in the end it will be a little over 300 dollars for this light which is a lot cheaper than the 600-750 that they go for retail. If you search for Growmau5 on YouTube he has a six part video tutorial on how to build them. I felt fully confident that I could build my own light by the time I finished the series.