I'd agree with the previous post that you're probably better off working with some arbitrary relative log exposure scale, if it's simply a question of doing your own sensitometry tests.(posted 8635 days ago)
However, it should be perfectly possible to convert back from the light falling on the film, in Lux-seconds, to a real world subject brightness. The camera exposure is only one step in this process, and 1/60th @ f/11 doesn't mean a great deal on its own, except as an indication of the amount of attenuation that the subject brightness has suffered on its way to the film. A rough rule of thumb seems to be that the light falling on the film plane is equal to f number squared times 0.2.Without knowing what you want to arrive at, subject brightness, film density or whatever, there's no point in expanding on this simple relationship.
I have dug up some useful links that should give you all the information you need to know. See:
Exposure and subject brightness
Lens efficiency
and General sensitometry
These will probably tell you all you need to know.