Quoted from WolfManCat:
Have you ever tried the warm white leds? In my opinion they look similar to incandecents but with all the benefits of led technology.
I've tried them all and installed them all. In all different games. Used to be the point was to add a little more light in an otherwise dark game, but the trade off is the light doesn't always spread very well so you have to go even brighter. Then there is the inherent flicker even in the most expensive non-ghosting leds. Incandescents flicker as well, but it is much more natural and less noticeable.
What I found does work real well is invisiglass on a game with incandescents and seeing is no longer a problem, and at the same time the game now has that original look without those blinding leds.
Came to head a couple weeks ago with my fully led'd Dirty Harry siting next to my incandescent HS2 and I could see those high dollar frosted domed leds flickering behind the translate and HS2 with it's warm natural glow. It's done now and much more soothing on the eyes, and now the LED'd Earthshaker is waiting on another batch of bulbs to finish the project. Earthshaker's backglass and inserts are way better now, just need some more bulbs for the GI.
Again the whole secret of all this evolves around the invisiglass, without which, again it would be kind of hard to see. But arcades never had that stuff back in the day, and the games were still very playable.
Going thru the system and bulletproofing connectors is part of the procedure as well, but that is something that ought to be done anyway no matter what bulb you use. As far as excessive heat, they don't stay on 12 hours a day and winter will be here before you know it anyway.