I am a big fan of LED's in most machines; There are two major suppliers we are familiar with. One with great prices but a limited selection and the other with a great selection and good prices but failures are an issue for me.
I had a local player that was looking for a solution and started bringing me some pbulbs in to run in my machines. I have been running them for months now without a single failure in my arcade and I really love the selection.
I am especially impressed with th einterchangeable domes for clear and frosted or none at all. The warm white is a spot on match to a traditional incandescent and I am running them in the backglass of all my pre-90 machines.
Check them out and give them a try. I understand a pinside discount is in the works if it isn't a reality already