Yes, you have the answer! I never did like the illumination additions to the AL22 meters!
Nowadays I always use LEDs, the old tungsten lamps were truly awful, they invariably overheated and burned out.
Saying that, my TFPRO meters are fitted with standard tungsten lamps. I run them with a series 220 ohm resistor from the onboard 24V supply, they give adequate and friendly lighting and don’t burn out.