Fluorescent ballast applications

I think type1 or 2 is only the supplier coded numbers. In T/L ballast there nothing such standard. A T/L ballast can be conventional or electronic. In conventional copper wire/ Aluminium wire are the two type. In copper some are making energy efficient chokes. My advice: since the ballast you going to use will be fitted in some what moist and cool environment, use a ballast that do not have any connectors where wires are to be screw tightened; instead buy a sealed ballast through which two connecting wires came out to be connected to tube and then to power.

Decades ago-all Iron-cored Choke(Ballast) makers offered "Polyester" types.

Meaning the ready Ballast potted in Polyester?

Or was the Polyester referring to the wire insulation?.

Must have been to survive Humid environments.

In India today ,Steel armatured Cu/Al coiled Chokes(Ballast) is rare. Everyone is selling/buying Electronic Choke(Ballast).