Author Topic: Help with Identification of 1990 Street Light  (Read 1585 times)
AJCSI
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Help with Identification of 1990 Street Light « on: October 18, 2020, 11:40:57 PM » Author: AJCSI
Hello,

I am a forensic crime scene analyst. I'm working on an old case and I would like to know the make and model of the luminaire in my photo so I can get a spec sheet to learn about the light pattern distribution.

Here is what I know: The light was being used in 1990 in San Francisco. The city data shows that it was a 100w high pressure sodium.

Here is a link to the photo (I tried to attach it here for 30 minutes -- seems not possible; even at a size of 118kb.)

https://www.dropbox.com/s/l9mve183wthglpv/Luminaire%201990%20A.jpg?dl=0

Thank you if you can help.

AJ
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GEm1000
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Re: Help with Identification of 1990 Street Light « Reply #1 on: October 18, 2020, 11:47:18 PM » Author: GEm1000
Looks to be an American Electric 113 with a GE M2505R2 refractor
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AJCSI
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Re: Help with Identification of 1990 Street Light « Reply #2 on: October 19, 2020, 12:00:59 AM » Author: AJCSI
Looks to be an American Electric 113 with a GE M2505R2 refractor

Gem, that's helpful. Do you know where I could find data on the GE refractor? Very few results from a google search.

Thanks,

AJ
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joseph_125
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Re: Help with Identification of 1990 Street Light « Reply #3 on: October 19, 2020, 12:50:38 AM » Author: joseph_125
Street light drop refractors were typically made by two OEMs, Holophane and Corning Glass. The make and model is usually marked somewhere on the rim which is only visible from inside the luminaire.

If someone here that has a M-250R2 with a matching refractor, they could check their luminaire and provide that info. Then you can probably contact the manufacturer for more detailed data.

Most streetlighting refractors have a IES type rating on them. The IES type rating gives the rough distribution pattern of a given refractor. The page I linked is for LED luminaires but the IES types predate LED luminaires and were originally used to classify luminaire refractors.
« Last Edit: October 20, 2020, 12:13:52 AM by joseph_125 » Logged
AJCSI
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Re: Help with Identification of 1990 Street Light « Reply #4 on: October 19, 2020, 10:20:07 PM » Author: AJCSI

I know about the IES types, thank you.

Do you have a guess at which 100w HPS bulb would be typical for this luminaire?  Or are they all pretty similar?

Thanks,

AJ
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joseph_125
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Re: Help with Identification of 1990 Street Light « Reply #5 on: October 20, 2020, 12:19:23 AM » Author: joseph_125
Usually most luminaires would have used a clear ED-23.5 or ET-23.5 mogul based HPS lamp like this one. The lamp shape would vary by manufacturer but since they are in clear envelopes, it shouldn't significantly affect the light distribution.

Coated HPS lamps were also made but were significantly less commonly used for roadway lighting. The roadway luminaires had optics that performed better with clear lamps.
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AJCSI
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Re: Help with Identification of 1990 Street Light « Reply #6 on: October 20, 2020, 02:11:06 AM » Author: AJCSI

Joseph,

That is very helpful information. And it was great to have the photo model number.

Thanks!

AK
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