Re: Why do we need SOX? « Reply #30 on: May 18, 2021, 11:02:13 PM » Author: BT25
Quote from: wide-lite 1000 on May 18, 2021, 10:36:23 PM The problem I've seen around here is replacing "normal" streetlights with those stupid highmast things. Lets redesign a freeway interchange and remove the roughly 3-4 dozen 200w HPS streetlights and replace them with 8 highmast poles with 6-1000w HPS (or LED equivalent) fixtures on each pole . Tim, I understand your point, but most likely this has to do with the age of the old system. Most freeway interchange lighting systems were installed back in the 60's using MV first, then lumen equivalent HPS.
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	Re: Why do we need SOX? « Reply #31 on: May 18, 2021, 11:15:25 PM » Author: wide-lite 1000
I understand that the system was old and due to be replaced. But I don't understand why the new system need to produce so much light . You can literally see the interchange from close to 10 miles away at night ! The previous light levels were more than adequate .
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	Re: Why do we need SOX? « Reply #33 on: May 19, 2021, 02:05:30 PM » Author: Das Rheingold
Quote from: joseph_125 on May 19, 2021, 01:15:55 PM Apparently at least according to the MTO here, the fewer number of lamps and luminaires from using highmast to light an interchange makes it easier to maintain compared to the old conventional poles with cobraheads. Almost all the large freeway to freeway interchanges here were converted from their original 1960s era cobrahead poles (originally MV, later lumen matched HPS) to HPS highmast starting in the late 1990s. I looked on street view on Winnipeg and that’s what they have done, IIRC I think they used to have LPS for their highways, my memory could just be playing tricks on me though.
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	Re: Why do we need SOX? « Reply #35 on: May 20, 2021, 05:54:34 AM » Author: AngryHorse
Interesting reading, it’s clear though, people in the US still prefer their mercury lighting
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	Re: Why do we need SOX? « Reply #36 on: May 20, 2021, 08:02:38 AM » Author: Rommie
Quote from: Econolite03 on May 20, 2021, 01:45:39 AM Here’s a survey done in 1979 about the benifits and drawbacks of low pressure sodium street lighting by cities in California. Unfortunately, the lack of color rendering led to most cities not using them. This is one thing I've never understood. You don't need colour rendering from street lighting when driving, you have perfectly good headlights for that. You need contrast and to be able to cut through fog and mist, which LPS excels at
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Ria (aka Rommie) in Aberdeen
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	Re: Why do we need SOX? « Reply #38 on: May 20, 2021, 06:03:16 PM » Author: Rommie
That's sad. To me, LPS (I use the term rather than SOX, as my all time favorite has to be SLI/H) is the most amazing lighting ever. I have never liked white light for street lighting, for me it's always been the soft amber glow of LPS and latterly the golden tones of HPS. There's just something about it that makes me smile, and it saddens me more than I can say that it's gone forever, or will be very soon
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Ria (aka Rommie) in Aberdeen
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	Re: Why do we need SOX? « Reply #41 on: May 20, 2021, 06:47:31 PM » Author: Rommie
Quote from: joseph_125 on May 20, 2021, 06:43:25 PM I've always preferred the higher contrast of HPS, especially during inclement weather while driving over LED or metal halide. That being said, I think for downtown high streets, metal halide or even deluxe mercury vapour looks a lot better than sodium lighting. Well LPS will always win out in a contrast competition, but I do like HPS as well. We used to have a mixture of MH and HPS here, and if I had to choose between the two, then it has to be HPS. I just don't like white light at night. Also, with her poor eyesight and night blindness, Sammi can't see properly under it
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Ria (aka Rommie) in Aberdeen
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	Re: Why do we need SOX? « Reply #42 on: May 20, 2021, 07:02:27 PM » Author: Mandolin Girl
I found out something interesting about SOX light the other day. I picked up a calendar with small printing on it and for the first time in years I could read what it said without have to change from my distance glasses to my reading ones, so for me SOX or LPS is the best type of lighting out there. I can see perfectly to drive, unlike with the current crop of lighting that mimics the night time sensitivity of the human eye. I have night blindness, so that's the worst light possible for me and I need to hand over to Ria for the driving duties.
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	Re: Why do we need SOX? « Reply #44 on: May 20, 2021, 07:11:02 PM » Author: Rommie
There's the difference between us, I can't stand high colour temperatures, for me it has to be 3000K or lower. The best white light source I've come across is the 23/25W PAR38 self-ballasted metal halide lamps, at 3000K they're perfect for me when I have to have white light. Which isn't often, most of the time our place is lit with 35W SOX
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Ria (aka Rommie) in Aberdeen
Administrator, UK & European time zones. Any questions or problems, please feel free to get in touch

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