No idea on the current of the bulbs, they are some generic 12V bulbs, as long as they fit into the hole they can be replaced with LEDs/anything. Was googling that as well but arduino can't power many of them? would be much easier to just plug them directly on the arduino yeah. will provide pics in the evening when i get home.
now that you mentioned the inputs, they are two buttons and two pedals, both have a "click" when pressed, so are they considered "digital"?
this will be replacing an existing old (1960ish?) complex electronics wiring that doesn't work, so lots of leftover transistors/resistors.
as for control it's done by some programmed sequence, got this covered.
will check the light bulbs and post pictures as well as post the complete thing - i think the minimum is 4 inputs, 4 light bulbs and i think 2x 7 segment display.
quick edit: will buy/replace (anything) just to finish this.