Hello read that some one used a c beam for lighting in their home. I can no longer find it.
Do you mean a ceiling beam? Are any of these projects the one you are looking for: https://www.hometalk.com/search/posts?filter=ceiling%20beam?
A real structural beam can’t be drilled into just any old place & then there’s the ceiling box which is required by electrical Code.
What I did was use rectangular surface mounted “conduit” with its matching rectangular ceiling box.
Look on Utube
To use it for lighting how? Mounting light fixtures on to a beam? recessing light fixtures into a beam? .......