I have the explosive proof fixtures, ran on 12vdc edison socket screw in bulbs, wow were those a poor choice, dim and burnt out fast and got hot. I kept the bases and rewired for 120vac and used LED bright screw in bulbs, made a big difference, it is worth it. I also have loads of AC power available and 2 inverters which can run them. All on a gfci circuit of course. I also use typical plug in trouble light with an led screw in bulb, they just never break, or it seems so.
A mix of keeping what was good about the old and adding what was good about the new turned them into good light sources.
Other nice thing, my same Carling breaker switch with white handle was rated for AC use and has been fine not running on DC.
LED sure can save a lot of power, I also re socketed all my DC interior fixtures to G4 sockets and G4 cylindrical bulbs. I added an extra socket to most and three g4 sockets in one fixture, and they are nice and bright.
You can buy b15d to G4 adapters and G4 sockets cheap from Aliexpress, and bulbs too. Some bulbs I bought from Amazon.
Since they no longer get hot, I drilled an angled small hole in the reflector and epoxy them in. No the epoxy has not failed in a years use.
I put in 2 LED bulbs in each fixture as I wanted a brighter light.
These are good and bright and can be dimmed with an LED dimmer.
The bulbs are physically smaller than the ones I bought from Aliexpress, but put out same amount of warm white light.
https://www.amazon.com/gp/product/B06XNMFBMS/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1