Typically, you use one of the spare contacts to operate the lamp. Industrial controls are usually 24 VDC. Having even current limited 120 VAC is a shock hazard when changing lamps.
I know, I got annoyed when a manufacturer changed the design of their lamps and captured the heat with an O-ring and the plastic on the lens just cracked. So, eventually 100 of these push/button and lamp combo were replaced by IDEC LED combos. Yea, you had to pick the same color LED and lens face. Well worth not having to relamp.
Check the specs and find out what the lamp base is. You may be able to change to a lower voltage. Personally, don;t use incadesent bulbs. They get dimmer, but don;t burn out.
Check the specs and find out what the lamp base is. You may be able to change to a lower voltage. Personally, don;t use incadesent bulbs. They get dimmer, but don;t burn out.