I was looking into doing some lighting for some upcoming projects. I reached out to a company that sells LED's. We chatted back & forth, they gave me some ideas to try, so I placed an order on Thursday and had it at my door on Saturday. (From Colorado to New York).
I have some experimenting to do, but they offer a variety of sizes of LED's and supplies to make working with them simple.
This size card was included with my order, and I added a penny for reference:
If you're looking to light up a project, I suggest you check them out: