Our sop's are as above except for a bit of penny pinching
NAV lights ON only during hours of darkness to preserve bulb life
I have been using a bit of common sense with that particular sop for the following reasons:
Dificult to remember to turn them ON at the onset of twilight
We have dual lights anyway so if a bulb did blow it transfers to the secondary
As the above poster mentioned it is an almost universal standard NAV lights ON = a/c manned
and lastly
How much can a bulb cost? Yes I know slap on the word a/c compliant to a device and bump the cost up 10 fold