M-250R - 1963
This is my 1963 GE M-250R. This is the first generation, with the silver paint and no tab on the push-button latch. This light is 100W MV with a 120/240V ballast, wired for 120V. This light was obtained in April 2017 from a fellow enthusiast. It was removed from a municipality in Massachusetts that switched to LED lights.
M-100 - 1965
This is my June 1965 GE M-100. This light is the earlier silver version. The M-100 was introduced as a lower-cost mercury vapor light that allowed smaller municipalities and utilities afford to upgrade to new mercury vapor lighting back in the 1960s. The light had only basic design features such as open-optical (no refractor) and single-size slipfitter that only accepted 1-1/4" arms. This light is 175W mercury vapor with a 240V ballast. This was rescued from a MA municipality by a fellow enthusiast.
M-250R - 1965
This is my November 1965 GE M-250R. From a fellow enthusiast in Abington, MA. This was removed in the 90s changeout to HPS. This was originally 100W MV 240V but I changed the ballast to 175W MV 120/240V so I could light it up on 120V at the time. This is a transitional model with the silver paint and the tab on the latch. The M-250R was made like this only in 1965. Prior to 1965, they were silver with no tab on the latch. After 1965, they were painted gray with the tab on the latch. I obtained this in Summer of 2014.
M-250A - 1967
This is my October 1967 GE M-250A Powr/Door luminaire. 100W MV, 120V. I obtained this from a fellow enthusiast in Abington, MA in the Summer of 2012. This was removed in the 90s conversion to HPS street lights. GE's selling point on these "Powr/Door" luminaires was that in the event of ballast failure or introduction of newer lighting technology, all that had to be done to fix/upgrade the light was swapping the ballast door, which was wired to the rest of the fixture via a universal plug. However, very few places actually took advantage of that feature, instead finding it less of a hassle to just install new luminaires in the event of a ballast failure and especially in the case of the HPS conversions in the 90s. This luminaire model was in production from 1966 to 1985, but replacement ballast doors were available through the 90s. 
M-100 - 1968
My April 1968 GE M-100 Luminaire. This is the later version of the one featured previously. This one has gray paint, which GE started using in 1966 and has used ever since. Prior to that their street lights were all painted silver. Like the silver one, this one is 175W MV, 240V.
M-250CF Crimefighter - 1968
My April 1968 GE Crimefighter. This was a gift from a fellow enthusiast in 2016. Unlike most, this was made as a remote ballast fixture. I have plans to fit a proper 175W mercury vapor ballast in this fixture in the coming months. This is one of my very few street lights without an integral photocontrol socket. The crimefighters were not made with PC sockets. Any out there that I have seen with PC sockets have been added in the field. The Crimefighter was a special fixture GE designed in the 60s for Chicago to help combat their crime issues. The idea behind these fixtures was to flood light into every possible nook and cranny of the city in hopes it would deter would-be criminals. As a result, these lights produce a lot of glare, which can actually limit visibility, which, under the perfect circumstances could actually aid a criminal in not being seen.
M-250R - 1968
I have two of these June 1968 M-250Rs. Both are identical and were rescued from a closed down interstate rest station. They are 175W MV with 120/240V ballasts, wired for 120V. These are the last version made, with the gray paint and protruding latch tab.  The capacitors in these lights had to be replaced but the ballasts and everything else is all original. These are former Blackstone Valley Electric street lights.
M-400 - 1968
My September 1968 GE M-400. Originally 400W MV, 240V. The previous owner retrofitted it to 400W MH, 120/208/240/277V. The beauty of MH ballasts is that MV lamps will also work on them... This was obtained in Summer 2017 from a fellow enthusiast in western MA. This light was used in a parking lot (hence no PC socket) in Springfield until they replaced it with an LED.
Form 101 Hood - 1969
This is an old 175W MV 120V GE NEMA head from the late 60s. I got this without any optics, just the head with the ballast, socket, and photocell socket. As typical of "HX" type GE ballasts over the years, the ballast in this light is nearly dead-silent. 
M-250R1 - 1971
This is a New Old Stock (NOS) GE M-250R1 from July 1970. This was a Narragansett Electric Co. street light that was never installed. It has a 240V ballast with 120V photocell socket. This particular light (like most NECo MV lights) has a dual-watt 100/175W ballast that, depending on how you wire the light, will operate either a 100W MV or 175W MV lamp. The paint has some damage from being stored in what I presume to be a wet, dark environment. This was a gift from a fellow enthusiast in the Boston area.
M-400 - 1973
My NOS March 1973 GE M-400 "split door". This model was made from 1970 to 1985. It uses the same body as the M-400A Powr/Door, but this version does not have a door-mounted ballast. The ballast is in the top housing like a standard single door cobrahead. This particular light was an eBay score in 2010. 400W MV, 120/240V.
M-250R1 - 1974
My November 1974 M-250R1. 175W MV, 120/240V. This was bought NOS on eBay in 2013. It did not have a refractor when I bought it, but according to the catalog number, it was supposed to have a glass refractor. So I was able to find one and use it in this light!
M-250R1 - 1977
This is my June 1977 M-250R1. It's 100W MV, 120/240V. This was removed from a MA municipality converting to LED lights. It was rescued by a fellow enthusiast from northern central MA. I obtained this in December 2017.
M-400A Powr/Door - Late 1970s
This is my rare first generation M-400A Powr/Door with full cut-off optics. This light has a lot of very unique features not found elsewhere in the street light industry, even among other GE models. The reflector on this particular light is attached to the refractor door, with a twist-lock plug on the door that the socket is attached to. To relamp, the socket plus is turned counter-clockwise and can then be pulled straight out. The socket plug also features an auto-disconnect from the top housing when the door is opened. This feature is excellent when relamping a parking lot, for example, as the power to the lights can be on while relamping in order to spot burnt out lamps yet the socket will be de-energized during relamping. This plug-in socket feature does make opening the luminaire a little more difficult though. This particular light needs to be gently pried open with a screwdriver. 

This light had its original gear ripped out before I obtained it. This light was originally in service in Worcester in a municipal parking lot. I have since added a twist-lock PC socket and an OEM GE 250W HPS 120V ballast from a roadkill GE M-250R2.
P-400 Powerflood Luminaire - 1979
Here's my 400W MV 120/208/240/277V GE Powerflood fixture. Obtained from a fellow enthusiast in April 2017. 
M-250CF Special Chicago M-250R1 - 1981
Here's my NOS May 1981 Chicago special edition M-250R1. It has a "C" embossed on the door near the hinges. It's 100W HPS 120V and operates the bulbs at either 70W or 90W. A really weird oddball fixture for sure. Scored this on eBay. Unfortunately one of the hinges was broken when it arrived. 
M-250A - 1982
Here's my NOS September 1982 GE M-250A. It's 100W HPS with a 240V ballast and 120V PC socket. It's got rare 4-way optics. This is a prized member of the collection and was acquired from a fellow enthusiast in the Boston area.
​M-250R2 - 1985
This is my 1985 GE M-250R2 with full cutoff optics, 50W HPS 120V. This was a Brockton-Edison luminaire, obtained through an LED conversion. This was added to the collection in July 2018. Notice the typo on the nameplate. For line amps, the label says "LATER". (I apologize for the upside-down nameplate picture; I tried to fix the rotation but the website software refuses to show the picture in any direction but upside down.)
M-250R2 - 1985
This is my October 1985 GE M-250R2 with full cut-off optics. The M-250R2 was released in April 1985, making this among the first M-250R2s made. This one is 70W HPS, 120V and was a Massachusetts Electric fixture. This was added to the collection in 2015.
M-250A2 - 1987
Here's my March 1987 GE M-250A2 Powr/door with full cut-off optics. It was given to me as a 50W HPS (retrofitted from 100W MV). I have a spare 250W MH/MV ballast door for this light so I swap between the two, depending on what I need for light levels. This light was used in Worcester and was only in use until 1991. This light was added to the collection in 2015.
M-250R2 - 1992
This was made the 10th week of 1992. 1992 was the last year of the 1st generation M-250R2s. The following year, the door was changed to a flatter style and in 1994, they returned to a design similar to this door but without the recessed refractor. This one is 150W HPS, 120V and was a February 2017 Craigslist score from Connecticut. This is a Connecticut Light & Power fixture.
M-250R2 - 1992
This is one of only a few 100W HPS lights in my collection. This was a Brockton-Edison light, removed during an LED changeout in the city of Brockton. It was added to my collection in July 2018. It had an FCO glass on the door and a non-original cut-off reflector installed, but the ordering number on this states that it is a drop lens light. I have since installed a drop lens reflector in this. Either this was a rare drop lens EUA light or there was a mistake on the luminaire's label. Note the thin stroke wide number "10" on the NEMA tag. This was a rare thing for GE with the 100W tags. They only did this with the "10" and "25" tags. They did it much longer with the "25" tags. 
PF-400 Powerflood - 1993
This is like-new (shows signs of being installed but no environmental wear) 400W HPS GE PF-400 powerflood. It's got a 120V ballast. This is a Connecticut Light & Power fixture, coming from a Craigslist score in February 2017.
M-250R2 - 1993
This is the uncommon "flat door" M-250R2, with full cut-off optics. This one is 70W HPS, 120V. This is a Blackstone Valley Electric light, scored from North Smithfield's LED upgrade in northern RI. These are uncommon because they were only made for one year. This was also the last year for the 4-bolt slip-fitter. From 1994-onward, GE has used a 2-bolt fitter with "leveling steps".
PF-400 Powerflood  - 1994
Here's my other 400W HPS GE PF-400, obtained from a Craigslist add in Massachusetts. This is an Eastern Utilities light fixture.
M-400A2 - 1997
Here's my M-400A2, made 3rd week of 1997. It was originally 400W HPS 277V, but was converted to 320W PSMH 120/208/240/277V by the previous owner in the early-mid 2000s. This was removed from a parking lot that went LED. I repainted this light and added a photocell socket.
M-250R2 - 1999
Here's a 100W HPS 120V M-250R2. This came from a city's conversion to LED in Rhode Island. It has the narrow "10" NEMA tag, which I like a lot for some reason. This was removed from service in 2019.
M-250R2 - 2002
Here's the other 250W HPS 120V M-250R2 I got from Providence's LED conversion in 2016. This was also repainted, but I used standard gray colored paint. I also had to add a new NEMA tag to this light, so the NEMA tag is off a late 80s GE fixture.
M-400 - 2009
This is a 400W HPS 120V M-400 from Providence's LED conversion. This is a National Grid light and when removed, had a bad capacitor. I installed a new one and the light is as good as new! The paint is in very good condition on this light despite being in use for seven years. Almost looks like a new light!
M-250R2 - 2013
This light came from an LED conversion in southeastern Massachusetts. This light is 100W HPS, 120V. Still in nearly like-new condition. The paint's shine has just started to dull on the top of the light. Was removed from service in 2019 with its original Sylvania Eco lamp and gray Sun-Tech photocell (and those accessories are still installed on the fixture while it is in my collection).
M-250R2 - 2016
This light was a gift from a fellow enthusiast from Illinois. It was sent to me right from the factory! Made in June 2016. He had gotten it as a free warranty claim light since ordered his own that didn't work out of the box (turns out it was an easy fix he could do himself, but by the time he realized it, the replacement was already on its way). So I ended up with a brand-spanking new M-250R2! The way things are going, GE likely won't be making any non-LED fixtures in the future so I'm glad to have this example in the collection!