Which type of power supply is normally used inside the PLC is it DC or AC?

In panels of PLC like LCP PANEL and MARSHALLING CABINET the power supply used for Tube light inside panels is AC or DC ? Which one is generally used?

Inside the PLC panel, dc power is only used for PLC IP/ op, PLC CPU, and module. If we use dc power for lighting purposes due to any short circuit in the light it may hamper PLC and process. So best to use ac power for lighting. Which is isolated from PLC.