Well the frame actually costs nothing. He salvaged it from the public recycling bin in his area.
As I have said, personally I haven't used diy led lighting for my plants. But I strongly believe that almost all grow led panels and COBs in the market are overpriced. That's why for my small tent (which is what most people have if they are not commercial growers) I stick to the floodlights, which actually are on par with the "specialised" grow lights.
And of course consumption does matter so I seek the optimum solution electricity consumption-wise.
In 30 years of growing cannabis as you can understand, I have tried every indoor lighting solution. Led in all its forms, especially the last five years is the best. Super luminus with very low electricity cost.
Recently I began experimenting with solar led floodlights like
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And
Find many great new & used options and get the best deals for Flood Light LED Outdoor Waterproof Spot Lamp 10W/30W/50W 12V COB Integrated at the best online prices at eBay! Free shipping for many products!
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They are not the ones I purchased, just to let you understand the concept.
If I get something that reliably offers 3000k light in sufficient amount, I will head to this solution. Most systems offer 6500k or 4000k lights.
I started my experiment now in deep winter with few hours of light and I will continue throughout the year. For avoiding hermies I don't try with cannabis, I use tomatoes instead but I am certain I will find the right configuration and best timeframe, by this time next year.