To be clear I'm only meaning 1 led flasher in a circuit. In addition to that, it is in a location that doesn't blind you when playing. In back to the Future I put flashers in the back glass (one per circuit, where needed) and it really lights up the incandescent flashers on the playfield (not blindingly so but it is an appreciable difference). Same for Elvira, the flashers behind her . . . ::ehem:: . . . assets, in the back glass. They were really dim when they flashed and were not responsive. When I put a led flasher in the same circuit somewhere else, wow they flashed as one would expect them to. Places where one can get away with this trick is under inserts not directly in eyesight. My buddy once purpled the GI in STTNG and put a led flasher in the ball save insert between the flippers. It was rough on the eyes. I am very much an original-ist and want the game to look and feel as the game was intended to be when it came out. I only use warm white leds for GI and rarely use color leds under inserts. The games look as intended, just a little brighter and a little less old.
Zablon, I feel you are doing a disservice by not going led on the inserts. Try frosted 1smd 5050s. They are the perfect brightness. Go warms in warm color inserts, cools on cool colors, and red under red inserts (both cool and warm whites kind of bleach the red and it doesn't look good). Other than that, don't color match, things get lost in translation and look artificial. You will be amazed on how much better the light shows look. On Bad Cats, its amazing to watch when the inserts rotate opposite to the seafood wheel when it spins. I see you have a Time Machine, put "ice blue" under the blue inserts it makes the game look like it came off the factory line (don't use the hideous indigo/deep blue).
Anyway, just an observation I saw when goofing around with flashers and wanted to pass it on. Cheers!