People are going to be pretentious and say “don’t get lights from Amazon”, but here’s an actual link. These ones are bright and the color mixing is decent. Depending on the size of your theatre u may only need 8. Note they do use 3pin and not 5pin.

Obviously they are cheap and in the grand scheme of things, shitty. So I don’t know how long they will last, you get what you pay for but they do work.