Bruce,
The “purple” bulb was U.V.
I read an explanation somewhere, but my memory is that it was a short lived Canadian attempt at improving blackout driving where the U.V. Lamp would be used to illuminate white markings on the rear of preceding vehicles.
Attached are images from the May ‘42 Ram I and II instruction book, Apr ‘43 Ram II instruction book, and Jan ‘44 Data book, showing the progression of the Ram lighting arrangements.
The left bulb was clear throughout production, whereas the right bulb started clear, changed to U.V., then reverted to clear.
|