Assuming this is Electronic ballast (based on the 4pin lamp and on your location)
Electronic ballasts need a dry place. Inside a sealed/protected luminaire outdoors is okay, and indoors is okay. Behind the luminaire, where water might flow through on the wall, is to be avoided
There is a limit on the length of the wiring from the ballast to the lamp. Ideally it'd have to be close to the lamp - within a foot or so, but probably would work just fine within a few ft
Ballasts can be installed in any sort of standard electrical connection box or panel, or in specially made enclosures for ballasts. Most of those are for recessed cans with PLs, i.e. they are designed for use in the inner space of a ceiling. But can be used anywhere you want in a dry location. With a waterproof box they can be used outdoors
So, your main choices are :
- Ballast inside the luminaire
- Ballast in a box, with a 4+Earth cable to the luminaire
i am not familiar with your electrical codes, so i am suggesting what i see as "good practice" generally. Maybe your codes will have more specific requirements
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