bulbs for a Rotary machine?

[operator bell]

Since you haven't told us what make and model of machine it is or showed us a picture, we can only guess.

You may be getting watts and volts confused here. 6.3 VOLTS (not watts) was a popular lamp voltage, since it was the standard heater voltage for vacuum tubes. Most 6.3V bayonet or screw-in pilot bulbs, as used in pinball machines and old radios, would have been in the region of 2 watts. If your 12 volt, 5 watt, bulbs are dimmer than your 6.3 volt bulbs, then the lamp voltage is probably 6 volts. There used to be 6V festoon bulbs, back in the 1950s and earlier when there were also cars with 6V batteries, but I don't know where you'd find them today.

[coppinpr]

just for interest here are a couple of photos of my rotary. one as is and one in dark,no flash to show new bulbs in action, please note,the lights only come on when the machine is running so i had to photo best i could, paul........