Dovrebbe trattarsi del regolamento in materia di oscuramento

Nel tuo caso, tradurrei:

...in condizioni di oscuramento

Light discipline = Blackout = Oscuramento
Spiegazioni di seguito:

Light Discipline
the concealment from the observation of the enemy in the air and on the ground of revealing luminous signs of troops, military facilities, industrial regions, and populated areas and the simulation of such signs at dummy facilities.

In light discipline, buildings and other facilities are lit internally through the use of camouflaged lighting, and entrances, windows, and other apertures are darkened by means of blinds and other devices. The external lighting of buildings is concealed through the use of low-powered lamps, which are turned off during an enemy air raid. Signal devices and transport lights are camouflaged with caps, visors, and screens.
https://encyclopedia2.thefreedictionary.com/Light Discipline


The small lights, front and back, are called "cats eye" lights and are used by the drivers during blackout conditions (light discipline) to keep vehicles in line during night movements.
https://www.steelsoldiers.com/threads/m1009-blackout-lights....

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Noise and Light in a Survival Situation: How to Stay Hidden
Noise and Light Discipline

If you have served in the military then you are very familiar with the terms light and noise discipline. The military takes this seriously, as should you, or anyone else who has to move about at night and must stay concealed from an enemy or anyone that may be a bit too inquisitive. [...]
It is always recommended that you stay put after dark, but if you do have to navigate then light and noise discipline is critical.
http://prepforshtf.com/noise-light-survival-situation-stay-h...

Oscuramento (guerra)
L'oscuramento, durante una guerra o in preparazione per un'attesa guerra, è la pratica di ridurre collettivamente la luce esterna, compresa la luce diretta verso l'alto (o riflessa).
https://it.unionpedia.org/i/Oscuramento_(guerra)

https://it.wikipedia.org/wiki/Oscuramento
https://en.wikipedia.org/wiki/Blackout_(wartime)


no light visible to the enemy
https://www.armystudyguide.com/content/SMCT_CTT_Tasks/Skill_...

Light discipline restrictions as outlined by the hosting unit will be followed
https://www.difesa.it/SMD_/CASD/IM/CeMISS/Pubblicazioni/Docu...





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Note added at 3 days 18 hrs (2023-01-30 15:22:34 GMT) Post-grading
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