Here is a very rare (here anyway) M250A2! There are about 6 of them at a train station here, these will be coming down within the next few months so I will try to get at least one! I think they are 250 watt HPS.
Those fixtures are not too common around MD....we have MORE of the GE M-250A1 than M-250A2s....but in Washington DC....those GE M-250A2 are VERY VERY COMMON and come in both FCO and drop lens!