I'm about to shoot a small scene with my new K3 16mm and I intend to light it exclusively with candles. It's going to be shot with a pretty slow f4 Takumar 50mm macro lens - so I'll have a lot of candles. Depending on the actual situation (I haven't made any tests yet) I might also use a filling light, which would be tungsten (=the ceiling lamp in my room). The stock will be Orwo's N74, which has an ISO 400 for daylight and 250 for tungsten.
Now my question is - with candle light, on my light meter do I assume the speed to be 250 or 400 (or something in between)?