Gee lymph,
If you're going to use 3x123's, a Reflectalite GH24 is LOTS better than the Mag 5 cell bulb.
BUT....if you're going there, 3 3AA to D's, a WA1185, and a smooth reflector in a Mag!!
Nothing else is close until you get to the Osram and other Superbulbs.
Bill