Startup color of HPS « on: September 02, 2018, 09:12:28 AM » Author: Cole D.
Do you notice some HPS fixtures with no color change at startup? Sometimes when I go for walks, I notice my neighbor's HPS NEMA head starts with a white MV like color and then gradually warms to yellow and then orange. But last night I was walking and I happen to see another neighbor's HPS flood start up. There are two floods on the pole each with photocell and one was already at full brightness. But I happened to look just as the other struck and it was already a yellow/orange as it was starting, it just flickered a bit was the only difference, but no color change. Most any other fixture I see does start with white color, such as cobras, etc so I thought it was interesting how it was already orange color.
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	Re: Startup color of HPS « Reply #1 on: September 02, 2018, 09:28:54 AM » Author: dor123
Newer lamps have more sodium, so they are more orange at startup. Older lamps have less sodium and more mercury, so they starts white and turns bluish. High xenon pressure Super HPS lamps, usually starts bright white than orange than peach color of HPS. Mercury free HPS lamps, starts similar, but oranger and they turns yellower color. Non-cycling HPS lamps, starts out mercury all the way to full brightness, than turning to peach color of HPS lamps. Penning start HPS lamps, starts out reddish orange, than bluish, than orange, than peach color of HPS lamps. The white color of HPS lamps at startup, is of the xenon.
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	Re: Startup color of HPS « Reply #3 on: September 02, 2018, 01:43:19 PM » Author: dor123
Quote from: Danny on September 02, 2018, 11:15:32 AM I have some HPS lamps that are that knackered they dont even go to the golden colour before cycling! They just stay blue! The blue start up is usually a sign they are nearing end of life Here is such a cycler (Which has been relampped since). Here is an extreme case , where the lamp restrike for only several seconds while rectifying, than going out. However, not all HPS lamps, reaches to this state at EOL. There are some that cycling forever with reaching to HPS colour, and others that cycles for a while, than stop working.
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I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the international date format (dd.mm.yyyy).

I lives in Israel, which is a 220-240V, 50hz country.

	Re: Startup color of HPS « Reply #4 on: September 02, 2018, 04:33:52 PM » Author: RyanF40T12
Yup, the more worn out tired bulbs will start off looking like mercury vapor/MH then gradually warm to.. well.. warm colors.
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	Re: Startup color of HPS « Reply #5 on: September 02, 2018, 04:40:36 PM » Author: Cole D.
I see, and this makes sense, because those floods were only installed a year or two ago. The bulb in that NEMA who knows how old it is. Unfortunately that means it will probably get replaced with LED when it does go EOL for good.
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Collect vintage incandescent and fluorescent fixtures. Also like HID lighting and streetlights.

	Re: Startup color of HPS « Reply #6 on: September 02, 2018, 05:08:49 PM » Author: RyanF40T12
maybe.. HPS will be around for a long long time yet..
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	Re: Startup color of HPS « Reply #7 on: September 02, 2018, 05:34:05 PM » Author: Cole D.
True, but my utility company seems to replace any lights that are not functioning with LED. They said they don't just change them out, but too many of the NEMA heads have gotten replaced for me to think they were all ballast failure. I don't think they relamp them anymore. If it was a Duke owned fixture, I would have more of an expectation they would still relamp it if it failed.
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Collect vintage incandescent and fluorescent fixtures. Also like HID lighting and streetlights.

	Re: Startup color of HPS « Reply #8 on: September 02, 2018, 06:36:09 PM » Author: Rommie
Quote from: RyanF40T12 on September 02, 2018, 05:08:49 PM HPS will be around for a long long time yet.. Not around here, unfortunately; they're vanishing fast, every time I go out I see more and more of them gone, replaced with awful glare bombs that have no optical or aesthetic properties at all  For example, not long ago they replaced ALL of the HPS in our street with LED's while we were away for 2 weeks, I thought we'd driven into the wrong street for a moment..! There are still a few HPS and MH street lights around in nearby streets, but they're getting scarcer by the day
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	Re: Startup color of HPS « Reply #10 on: September 03, 2018, 11:01:24 AM » Author: HomeBrewLamps
Some of my lamps start up with white others orange.. I notice it most often in my 70 Watters...
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	Re: Startup color of HPS « Reply #11 on: September 03, 2018, 11:02:11 AM » Author: Cole D.
Wow, sounds interesting. Where or what purpose do you use these high wattage bulbs?
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Collect vintage incandescent and fluorescent fixtures. Also like HID lighting and streetlights.

	Re: Startup color of HPS « Reply #13 on: September 04, 2018, 01:56:33 AM » Author: RyanF40T12
Many football and baseball fields will use the high wattage HPS lamps to use after the game for the grounds/stadium crews when cleaning up.  Coors field here as well as the Air Force Academy football field uses em.  It's kinda cool to see.
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	Re: Startup color of HPS « Reply #14 on: September 04, 2018, 02:37:35 AM » Author: Medved
The HPS are used to save the expensive "TV grade" MH's and to save some power for the clean up/maintenance work after the main event. It takes a few hours, but it does not need that high intensity and quality illumination as the main event does.
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