A frequently quoted guideline for basic lighting in the living room is approx. 100 lm/m². If you look at the number of watts, you should make a distinction between an incandescent bulb and an LED lamp. To illuminate the living room well, an LED lamp should have about 9 watts. This corresponds to approx. 60 watts for an incandescent bulb.
It should be noted, however, that the furnishings and the wall colour also play an important role in the effect of the brightness. The brighter your wall colours and the furniture, the further you could reduce the brightness. Another important point, as explained above, is the natural light that shines into a room.
To cover the entire range, it makes most sense to choose a relatively bright lamp with a dimmer. This gives you more flexibility and you can also save a lot of electricity. If, however, a relatively large amount of natural light enters the room, then you can also choose a lamp with a lower light intensity, as natural indirect light should always be prioritised.