On the word "luez" in the marginalia of folio f17v

[MarcoP]

   

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I can confirm "lucem". In the clip I posted above, the line is even more concentrated on the "c3" part.

So I assume the word in the VM can be read as lucem, but only if we are willing to ignore that the first letter is "k"....

This must also be "lumen" (neuter) because the next word is "suum".
If it were "lucem" (feminine) it would be "lucem suam".
The meaning is the same ('light' but also 'the eyes'). 

cum sol oritur, sidera non admittunt lumen suum sed obscurantur et disparent

when the sun rises, the stars do not tolerate its light, but are obscured and disappear

Lumen also is a better fit for the macron, which stands for the missing 'm', while the final 3 appears to stand for -n. See this entry for "flumen" (You are not allowed to view links. Register or Login to view.):