What are some examples of Powergroove fluorescent lamps/fixtures you've seen? For me, I have seen a gas station fixture in an empty lot, and Powergroove strip lights at some abandoned gas station.
Also, when were the last Powergroove tubes made?

I've only seen them a few times "in the wild", always in gas station parking lot lights and never working. I have, however, also seen some of the ones in John's and Jeremy's collections.

I've seen them twice in the wild. Both installations were disused underpass lights.



I also have a few of the 4' lamps in my collection, those were bought from a Restore.