I have been seeing a lot of newer ambulance installs going to the M series of light heads instead of the 900 series. I really don't understand why? I have always loved the 900 series and so on but not the M Series. I also think that the shape has something to do with it, by going to a more oval shape light head it doesn't look right on the side of an apparatus. But thats just me. Anyway i was wondering if somebody could explain just why everybody is abandoning the 900's.