Rick is right, LED's can really dress-up a machine. Be careful though, some styles of LED's can short out things, I think it has to do with how the leads are wrapped around the base of the bulb so they are on both sides of the base. And it depends on the lamp socket type that the slot machine uses. There are discussions here on NLG about LED's, in general you want to get the type that have the lead that doesn't wrap around. You can probably look at a bulb in your machine and see how its leads are done. Notice the difference in the LED base leads in photos below.