I have found it best to a quart or two of all headlight fluids on hand, especially the summer and winter blends. The summer blend is formulated to compensate for the lack of cooling provided by the winter temperatures. When your headlamp lenses get too hot, they will take on a purple tint over time....you see this in prewar cars many times, theu didn't have these fluids back then. The winter blends contain an small amount of propylene glycol to keep th e lenses from cracking from the sub-zero temps that occur at speeds above 20 mph when the ambient air temperatures drop below 37 degrees F.
Now, in reference to the dimmer switch idea, you MIGHT try find a brighter switch replacement. These were commonly found in the Swedish, Dutch and Finnish cars of the era. They work on the same concept as a dimmer switch but instead of taking the bright headlight and reducing it, they took the less bright headlight and made it brighter. HOWEVER, you will need to upgrade your generator/alternator and put some kind of cooling fan over the switch as they DID tend to get very warm and sometimes melt or set fire to the surrounding carpet.
And on a final note, I HIGHLY recommend going to your local paint store and buy some Garage Floor Checkered Paint for all of your garages. It comes in Black/White, Blue/White, Red/White and other combinations. Goes on REALY easy and makes for an AMAZING display area for your LBC!
Hope this helps!!