Short answer: Yes, it is allowed. The standard lighting in the interior of a car meets strict rules, also the nowadays so fashionable mood lighting in 95.186.072 different colors.
Blinding and reduced night vision
However, we understand that our father did not like that we did a reading light in the dark. The light ensured that he could suffer from glare (when looking back in the interior mirror), reflections in the windows and possibly reduced night vision.
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It is not for nothing that the bridge of a seagoing vessel is darkened at night, including a thick curtain around the illuminated map table. This happens not to ruin the night vision of the officers on duty. For the same reason, red light is often used instead of white light.
Nevertheless a fine based on Article 5
Incidentally, you could indeed get a fine for driving with interior lighting engaged, but then on the basis of Article 5 of the Road Traffic Act. It states that you should not behave on the road in such a way that you cause or cause danger or danger.
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What that with relief has to do? Well, if you stick flickering Christmas lights on the dashboard or a shiny disco ball hangs on the ceiling, then that can not only distract other road users, but also have an effect on your sight. And so you may put others in danger.