Quoted from lyonsden:If you LED the game, get non-ghosting LEDs for the controlled lamps.
Even if you go this route, you'll lose the fading effects in the game: it especially ruins the attract mode.
LED OCD might also work well; but if you just want bright, clean the inserts, clean the bulbs (or get new ones), and you may be surprised how good bulbs can look, and you'll still have the nice fade effects.
I have a mint RBION (https://pinside.com/pinball/forum/topic/for-trade-ripley-s-believe-it-or-not), and tried some LEDs and it only seemed marginally brighter, as the bulbs and inserts are clean like new.