Most likely it MAY me a merc.....just thinking because it does not have a photocell socket at all...not even a bump.....that was an option in older streetlights....although some companies had left a bump like the AE and the Line Materials while the GE and Westinghouse kept the top smooth.....free of any "bump" for the spot for the photocell....

I used to have hard time telling if it was OV-15 or OV-25...but the easy trick is the refractor shape AND the OV-25 has a sharper angle

it Could Be Possibly....i know alot of the Older Cobraheads in Gadsden are HPS...i know the OV-25 and OV-15 Tudors are HPS For sure...i saw a Picture of Gadsden at night..and a Stretch of OV-25's on this Road..but Further down were showing in HPS...but these could also be MH..i wouldnt doubt it...the city does use MH.

Incidentally, that is not a 15' truss arm. More like a six or eight footer.

I've seen HPS versions of these on the PA Turnpike right by the Monroeville exit.

Cool that HPS Versions exist today...i mean...not cool like MV...but cool that they are Still Up...and Nimo...whats the Easiest Way to Tell the Lenght of the Arm?

The average fixture is about two feet long, I then try to picture it again and again along the arm and get the length.

It does look 8 footer to me right there.....it closely resembles the size of our local utility pole 10 foot truss arms in my area...and this Silverliner right there is 3 feet long to be exact!

I agree, its 8 Ft.

I also agree with the above it looks like it's 8ft too. This arm pictured look to be around the same length as the 8 foot aluminum taper e arms commonly used here.

Sorry Jace...This Silverliner is Sodium Infected!

I personally don't consider the HPS conversion to be a "disease" anymore. LED streetlights ARE the disease!

True...HPS Conversions from MV aren't Bad...i just wish more old Fixtures could be converted than Scrapped...given the utility sometimes that is less Time or Cost Effective than simply swapping Fixtures.

Or they could also use HPS retrofit lamps that way they don't have to remove the ballast and not waste a good fixture.

HPS retrofit lamps have much shorter Life Span's though...which is Unfortunate....LED's aren't common at all Here Vince...iv'e seen only a Few in Texas.

PG&E in northern California converted some of their mercury fixtures to HPS back in the early 80s. Santa Cruz, where I used to live, has them all over the Westside area.

Got any Pictures of those?

I much rather they convert the fixture over to HPS rather than scrapping the fixture but most fixtures here were scrapped aside from a few.

Absolutely no Conversion's here...everything Broken,Old even Working is Replaced by a New Fixture.

I never see older streetlights in my area converted either, thousands of them were discarded when the power companies did those upgrades within the last 5 years requested by many municipalities. I saw some Westinghouse OV-25 and Westinghouse OV-35s converted to HPS in Pittsburgh but they were replaced anyway.

thats Typical of the Throw Away Attitude in Society Today....its Terrible....and its not just streetlights either....America is just Wasteful...hate to say it...but we need some improvement Big time.