Lighting Upgrades in Tyler.

[chapman84]

Many municipalities in my state had their streetlights upgraded to HPS as a result many mercury vapor ones have been discarded so they're not too common anymore and my utility company started replacing defective MV streetlights with HPS streetlights in mid 2008. Examples:

  175 watt MV=100 watt HPS
  250 watt MV=200 watt HPS
  400 watt MV=200 watt HPS
1000 watt MV=400 watt HPS

[mercuryvaporrocks]

Duquesne Light and Allegheny Power both install Cooper Lighting OVZs and OVXs but their wattage configuration is different though for HPS. Allegheny Power replaces defective 175 watt MV streetlights with 100 watt HPS stretlights only, Duquesne Light replaces defective 175 watt MV streetlights with 70 watt HPS and 150 watt HPS streetlights depending on the location and volume of traffic. I have seen defective 400 watt MV streetlights in their area replaced with 250 watt HPS and 400 watt HPS streetlights, even 150 watt HPS. Allegheny Power just replaces defective 250 watt MV and 400 watt MV with 200 watt HPS streetlights.

[Jace the Gull]

My electrical company does this...

100 watt MV = 100 watt HPS
175 watt MV = 150 watt HPS
250 watt MV = 250 watt HPS
400 watt MV = 400 watt HPS
1000 watt MV = 1000 watt HPS

crazy eh?! 

At first I thought that was like going overkill....because HPS uses more lumens than MV and point of HPS was to use more lumens per watts...

But I thought again...it could be good thing.......that it may be better because if you use more lumens on HPS to make better visibility.....

[Medved]

What i observed here:
250W MV -> 150W HPS (but about two decades ago)
2*125W MV -> 150W HPS with group dimming (voltage reduction)
125W MV -> 70W HPS
80W MV -> 58W CFL

[mercuryvaporrocks]

I have never seen 1000 watt high pressure sodium used for streetlighting, except at Reliant Energy's plant in Springdale Borough which used to belong to Duquesne Light and they do have it on their lighting tariff for sodium vapor.

[Form109]

My electrical company does this...

100 watt MV = 100 watt HPS
175 watt MV = 150 watt HPS
250 watt MV = 250 watt HPS
400 watt MV = 400 watt HPS
1000 watt MV = 1000 watt HPS

crazy eh?! 

At first I thought that was like going overkill....because HPS uses more lumens than MV and point of HPS was to use more lumens per watts...

But I thought again...it could be good thing.......that it may be better because if you use more lumens on HPS to make better visibility.....

That is Very Crazy......but like you said......Brighter to compensate for the Lower Visability of HPS.

[Jace the Gull]

I have never seen 1000 watt high pressure sodium used for streetlighting, except at Reliant Energy's plant in Springdale Borough which used to belong to Duquesne Light and they do have it on their lighting tariff for sodium vapor.

Come to Baltimore City...and you'll see 1000 watt HPS used for streetlighting on some of the city roads...

[Form109]

does HPS Come in any Wattage higher than 1000?

[Medved]

I try to imagine, how it would look. Here the highest wattage for HPS streetlights is 150W and on main roads use a dimmer box reducing their power input down to 100W during the night. But poles are here really very close to each other (compare to what i've seen in US when driviing in Salt Lake City from the airport - but i wasn't there at night),

[mercuryvaporrocks]

Pittsburgh has mostly 200 and 250 watt HPS and some 400 watt HPS ones as well.

[Form109]

Pittsburgh has mostly 200 and 250 watt HPS and some 400 watt HPS ones as well.

our Main Streets and Larger Residental Streets are lit with 250 and 200 Watt Sodium as well.

our Residental streets are still mainly 175 Watt MV Nemas with Spot Replacements of 100 Watt HPS.

and Recently with those new lights they have put around Loop 323...those are 400 Watt HPS.