Hi @grogin
Welcome to the growers network community. Check the search option on the top menu bar and search terms like “DIY LED” or cheap LED system. Take my hat off to you for wanting to make your own, I would rather buy a tried and tested system from growershouse.com
https://forum.growersnetwork.org/t/diy-led-light-build-help
https://forum.growersnetwork.org/t/diy-led-grow-light-need-help