California Special model 7-120 - Ever Seen?

That's pretty interesting, so its 2 non rotating beacons with 3 par 46 lamps. the Odd lamp acting as a possible alley light.

I don't think I have even seen a Par 46 Dietz beacon even not CA spec.
 
I have never seen these on any units in CA. And they had to run the PAR46 bulbs in order to meet Title 13 back in those days for steady burn and rear flashing. Those are very unusual, the concept however isn't bad, many of the CA agencies that ran one single revolving light in the center would then place two rear and two forward PAR46 on the ends and some the speaker right next to the rotator of the roof rack blocking 50-75% of the side warning light.
 
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That photo is extremely unique in its self, that is the California Highway Patrol with a bar I have never seen them use especially with a center mounted rotating light with a CLEAR lens. In 1968 they tested roof mounted lighting, however they stayed with the red spot but in 1970 for high traffic areas they once again tried over head bar similar to that in the photo. CHP only went with (4) PAR46, two forward and two rear facing. The two front lights, some had (2) red and several were trying the passenger side blue, the rear was (1) amber and (1) blue. Also, they did not ditch the red spotlight or the amber/red flashing lights in the rear. You can still see them in that picture hanging in the back window. These units were mainly assigned high traffic areas, LA and surrounding areas, San Diego, San Francisco and Sacramento. Shortly around 1972-73 they too went to the Federal TwinSonic CTS. which most CA. municipal and county agencies had switched over too. Cool Picture though.
 
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Huge transitional period for emergency lighting…the roof mount system made it easy to integrate existing lighting systems into more effective lighting, then FedSig introduced the model 11 TwinBeaconRay and made it possible to get effective lighting and siren warning with “easy” transfer to other vehicles (move the rotating beacons to the outside—one master, one “slave” for full 360* coverage minimizing amp draw). But the FS model 12 TwinSonic was the game changer! All enclosed “ hand clap” synchronized flash pattern with the CTS meeting all CA requirements! And the rest is vintage and collectible history.
 

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