Overall, if the paint is going you probably have a few more years in planning for a tear apart and sand blasting of the steel frame, than re-painting in high temp. Just something to plan for in not rusting
thru to be of concern.
As above, the overall
fixture is probably viable, but for it's wiring in looking for frays in it that expose
conductor, being grounded that is simple enough to do - tight in not moving if there, and the lamp
socket well written about in the past about how to resurface or replace.
Outer coating, for my museum I tend to get stuff far past in rust just easy to work on. On the other
hand at times just minor teating with rust repellent often is sufficient to stop it's spreaed. This even under heat but as a caution to the extent of that heat of time before repainted.
Don't know of if helps, but if as described in minor rust or paint bubbling, can do now or wait a year or three in not ovrall concern about the body. More about the wiring and
socket in concern.
Yea, Fresnels have been around since like 1934 - and I have an origional G-30
globe lamp medium screw version. Or could be like 1928 dependant on the source. Still though they do what they do in only the Osram BTH doing something glamorus for them in matching
color temperature to that of the
Leko fo the past like 40 years since they went
halogen. Still, overall since say 38' no changes to the overall design concept of the
Fresnel, and until we all go
LED, doubt no matter how old these are, there would be any difference in new ones.