LED's are great done properly, but in other threads we've seen some done pervertedly too. no need to mod an EM game for LED's, you can get nice fully rectified 44-47 base single and double LED's that'll pop right in. what will usually be lost from doing it is the slight dimming of static bulbs when the blinking bulbs blink. it might be possible to get some of that effect back by using a bunch of current limiting resistors, sacrificing some brightness of course.