If one looks at the data sheet, http://www.gelighting.com/LightingWeb/na/images/olp2937-ge-street-lighting-201sa-unit-pack-sam-roadway-hid-datasheet_tcm201-61492.pdf, you can see that GE only offers the 201SA in HPS.  Is there a reason they do not offer it in PSMH?  The M250, M400, PF400, and PF154 are all offered in HPS and PSMH.  Would a Metal Halide ballast not fit, or could they not make one that would fit?

If one looks at the data sheet, http://www.gelighting.com/LightingWeb/na/images/olp2937-ge-street-lighting-201sa-unit-pack-sam-roadway-hid-datasheet_tcm201-61492.pdf, you can see that GE only offers the 201SA in HPS.  Is there a reason they do not offer it in PSMH?  The M250, M400, PF400, and PF154 are all offered in HPS and PSMH.  Would a Metal Halide ballast not fit, or could they not make one that would fit?

Theory 1: (least likely)
Possibly because a PSMH nema would require a closed bottom and they are too lazy to make a closed refractor? Though it could just have an EX socket for protected lamps only. I did see a 175w MH nema head, complete with red "17" sticker last year. The housing was not any larger than that of a regular NEMA head, so a PSMH ballast should fit...

Theory 2: (most likely)
They want people to buy an LED area light if they want white light, therefore they do not offer it in PSMH.

By the way, what are GE PF400's and PF154's?

Quote from: M250R201SA on May 05, 2016, 08:30:06 PM

If one looks at the data sheet, http://www.gelighting.com/LightingWeb/na/images/olp2937-ge-street-lighting-201sa-unit-pack-sam-roadway-hid-datasheet_tcm201-61492.pdf, you can see that GE only offers the 201SA in HPS.  Is there a reason they do not offer it in PSMH?  The M250, M400, PF400, and PF154 are all offered in HPS and PSMH.  Would a Metal Halide ballast not fit, or could they not make one that would fit?

Theory 1: (least likely)
Possibly because a PSMH nema would require a closed bottom and they are too lazy to make a closed refractor? Though it could just have an EX socket for protected lamps only. I did see a 175w MH nema head, complete with red "17" sticker last year. The housing was not any larger than that of a regular NEMA head, so a PSMH ballast should fit...

Theory 2: (most likely)
They want people to buy an LED area light if they want white light, therefore they do not offer it in PSMH.

By the way, what are GE PF400's and PF154's?

Are Metal Halides THAT dangerous that they require a closed bottom?  When I was in Middle School, my gymnasium had open bottom Metal Halide inside the gym.  As did my high school. 

The PF400 and PF154 are Powerflood luminaires.  
http://www.gelighting.com/LightingWeb/na/images/olp2974-ge-powerflood-pf400-pf4s-pf4t-floodlighting-hid-datasheet_tcm201-61059.pdf
http://www.gelighting.com/LightingWeb/na/images/olp2973-ge-powerflood-pf154-pf1s-pf1t-floodlighting-hid-datasheet_tcm201-61053.pdf

Are Metal Halides THAT dangerous that they require a closed bottom?  When I was in Middle School, my gymnasium had open bottom Metal Halide inside the gym.  As did my high school.  

Come to think of it, when I was in middle school, I don't remember anything about protected or open rated metal halides either.  I'm pretty sure the school gym lights didn't use protected lamps, and they were open bottom, with just a wire guard on the bottom.  I wonder when protected metal halides were introduced.

Quote from: M250R201SA on May 05, 2016, 09:23:56 PM

Are Metal Halides THAT dangerous that they require a closed bottom?  When I was in Middle School, my gymnasium had open bottom Metal Halide inside the gym.  As did my high school.  

Come to think of it, when I was in middle school, I don't remember anything about protected or open rated metal halides either.  I'm pretty sure the school gym lights didn't use protected lamps, and they were open bottom, with just a wire guard on the bottom.  I wonder when protected metal halides were introduced.

I have 1 70w MH Sylvania Metalarc Pro-Tech lamp that has a glass shield around the arc-tube to protect the lamp in the event of an explosion.  I got it around 1997-1998.

Is the 201SA for small lamps up to 150W ? If so then they use choke ballasts. Maybe there is no room inside for bigger MH ballast and ignitor

Most supermarkets here use MH highbays, open and with unprotected lamps. And they are usually badly maintained too - Thery leave lamps to EOL. Still explosions are rare

There are few aspects, why in the past the unprotected lamps were OK:
- First, the safety "culture" was not that strict as it is today. The reason behind is, there were many way more dangerous things (for a building fires,...) present in everyday life not treated, this was way below that danger level. In other words way greater risks were considered as normal, nothing to worry about than today.
- There were not yet that many incidents and mainly the law suits didn't happened yet...
- The MH technology was new, the fact these lamps tend to explode at the EOL (speaking about US probe start on the CWA) has yet to be experienced. And the first thing was the aim of the industry to first blame the "individual manufacturing defects" and/or unfortunate operating mode (permanent ON installation, so coining the recommendation of a shut down for 15minutes each week), it took some time till the industry concluded it is not possible to exclude the explosions.
- Generally the proactive safety analysis (identify the possible risks before any such incident ever happened) was not that common, a fix for some danger was only considered after some incident really happened. So it was only recently, when the analysis of failures leading to lamp explosion was really done, with a conclusion the explosions can never be fully prevented, so the only thing remaining is they should be contained (requiring enclosed fixture or the arctube shroud).

These are 120 volt so they wouldn't use choke type ballasts

For HPS up to 150W S55 its a choke on 120V (There is 150W S56 that needs more than a choke, but thats European lamp and not used widely in the US)