Better to use a mogul E39 based lamp. What kind of HID is it? Did you post any pictures?

No, but I may later

That video is 12 years old, the link in its description goes nowhere, so I don't know. I've never heard of it, anyway.

I heard from a street light lineman that the Chinese EYE mercury lamps go dim after 2-3 years, which is unfortunate. There are two strip malls with mercury downlights near me with Japanese EYE lamps and many were already there when I moved here in 2007, still going strong.

Today I found a pl-s 11w blb box from the same brand, and same warning!
This time they remembered the bracket!

Today, I got the rest of the lamps from the shop. My first circlines !!!
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@wide-lite 1000
I've experienced this too, only a few comments for over a dozen pictures, not even on the interesting ones!
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Did this starter exist or is it a scam/joke?
https://www.youtube.com/watch?v=tLDfj4i7TJY

Could it be a mall? definitely looks like a mall

The arm setup makes me think this was taken at a former Kmart, but the building tells me otherwise. Maybe a former Ames department store?

 I have 11 Sylvania Metalarc M47 Floodlight bulbs, which my tennis club doesn't need because we have converted to LED.
Other tennis clubs cannot yet afford to convert to LED, and are looking for Halogen/Halide floodlight bulbs. But none of us seem to know what bulbs are equivalent of what other bulbs, and indeed what bulbs will go with which fittings.

A specific example is a Club who has HIE 1000W/U/4K 46109 Venture. We thought/hoped that our bulbs would be compatible, but our Sylvania did not go into their fitting. Can anyone give me an idiots guide please, to what info I should be asking/telling other tennis clubs about our bulbs. 

Eric, what's your eBay username, if you don't mind me asking? I'd love to buy some of your "excess" lamps...