The Thomas & Betts lights used GE capacitors from the factory so the cap would have the correct date on it unless its a very recent cap. These look like 90s lights to me. The 25 was made until 1983 or 1984 so these aren't any older than the mid 80s. nice finds though!
Oh, the newer AEL fixtures have ballasts that are basically identical to Advance ballasts. Only thing different is that they brand them as AEL instead of Advance and have slip on connectors instead of leads.
yeah i had asked Joe M about a MV 113 he had and he said they had used GE caps in the 90s. I was like huh? i thought they were rivals?! It turns out Westinghouse used GE caps on the HPS ballasts too before Cooper bought them out. Thomas & Betts used their own ballasts like these. I've always seen T&B's ballasts as sort of crude since the windings aren't nice and even lol. When Acuity Brands bout Thomas & Betts's street light line, they still used T&B ballasts until I guess the transition was complete and they started using OEM versions of the Advance Ballasts. It seems GE is the only street light company that hasn't changed companies. they've changed their name quite a few times (G-E, General Electric Company, General Electric Lighting, General Electric Lighting Systems, GE Lighting Systems, and now GE Lighting Solutions). I don't know the exact order but it was something along the lines of that.
It seems GE caps are the most common brand of cap in a fixture, next brand is probably Aerovox. IIRC some fixtures made in the early-mid 2000s still had the old TNB ballast design.
I think the 115 was introduced in 2003 so around that time is probably when they started to use OEM Advance ballasts. I'm not sure though. After the mid-90s i don't think Thomas & Betts lights were used here.
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And thanks for the info Mike, I had a good feeling you'd know
BTW, do these have dates on the caps?