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Hi Ninanoki

Yes you can read colors of a photo with 15 bit resolution for all 3 channels of Lab.   This can be done with either the eyedropper tool or the color sampler tool and looking at the info panel.

Right click on the measurement value and change it to Lab mode and 16 bit mode

L range is 0 to 32768

a range is -16384 to 16256

b range is -16384 to 16256

Changing to some other scale would just be a math multiplication away.

Note that this level of resolution only makes sense if the image was capture in Raw (14bit camera) or TIFF 16 bit mode and likewise saved in 16 bit mode. If you drop to 8 bit mode at any point along the way, the values will be posterized to 8 bit values.

Not sure this answered your question or not.