Don't forget that this may also be a "regional thing". I learned a long time ago that there is lots of latitude given to the different regions. About 1976 I was grounded as soon as I landed at Orangeville, enroute from Vancouver to Montreal on a ferry flight. Reason? I had a white strobe light and plywood bearpaws. They weren't letting me fly anywheres un til they found out the aircraft was registered in Pacific Region and then they backed off completely and away I went. Those bear paws they laughed at and they said ALL strobes were to have a red lens in the east. I was told that if it would have been registered anywhere in the east, the aircraft would have stayed there until it was an antique before they would have allowed it to move without those changes.
I suspect the different answers here may just be another reflection of that. My info came from a Dr. Danforth in Edmonton and is dated about the last of April this year. I know that what is accepted down east is not necessarily accepted in the western regions or varies somewhat. This may well apply to certain procedures or items with regards Aviation Medicine. I suppose there are valid reasons for the differences, but I have a tendency to check first when moving west to east or visa versa, just to be on the safe side..