@Mr.Sparkle is very knowledgeable in this field. It was with his advice and design we made ours. He has a thread about building DIY LEDs
https://overgrow.com/t/the-cheap-and-efficent-led-lighting-thread/
https://overgrow.com/t/cheap-led-strips-a-viable-alternative/
edit… DigiKey also has a forum for help
also another of their forums