Retro-X Single 8 200 ASA in artificial light

[7OSE9]

Do you know the Retro-X 200 ASA film for Single 8?
I use it with a Fujica ZC1000, camera, as is known, does not have the external setting for the Asa, but uses only the notches on the cartridge.
I'm going to use this film with artificial light, obviously without a filter, it's a b/w film.
Considering that cartridge contains an Orwo 200 Asa daylight, and that the Orwo UN54 (ex. in Double 8 format) is setfor 100 or 125 asa in daylight and at 80 or 100 Asa in artificial light, this film should be set to 160 Asa. It's Ok?
But how do you do with the mentioned ZC1000?
It's good setting the Fractional Exposure feature of this camera at "2"?
More comfortable than the method at left, I suppose.

[7OSE9]

I answer myself: better the "exposure compensation" option at 1/3rd stop over, with the needle just above the center. For have 160 Asa.
With the Fractional Exposure Control at "2" the camera would give a 100 Asa exposure, too much.