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Hi Ninanoki

You have interpreted by equation correctly yet you did the math wrong.

Using you numbers and my equation

L:   61.29 *327.68 = 20083.5072 = 20084 (when rounded)

a: 0.93 * 128 = 119.04 = 119 when rounded

b: 9.28 * 128 = 1187.84 = 1188 when rounded

Now with the PS mode set to Lab and 16 bit mode, I ran your exact script and then filled a solid rectangle with the foreground color and placed a couple color samplers in the rectangle (sample size = 1 pixel) and below is the info panel with one sampler set to 16 bit and the other to 8 bit

Exactly as the equation predicted.

I will probably be offline for a while yet I suggest taking everything step by step to find where the error is on your end.  

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