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Ignoring plants that love or require direct sunlight, my understanding is that generally plants don't like it too much (leading to sunburn) and rather prefer bright indirect or filtered light. I did read though that direct sunlight is acceptable if it's only for a couple of hours a day, e.g. in the morning or evening.

Since my flat is somewhat dark but has some okay south window spots, I was wondering whether direct sunlight in Winter may be "less problematic" than direct sunlight in Summer. Spring is about to begin where I am and right now I'm measuring some 180k Lux (~16700 footcandles) of illuminance on the windowsills.

I'm mainly concerned about my new Monsteras but I also have some Alocasia, Peperomia, Rubber Tree and cuttings that could use some photons.

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Yes, direct sun can be acceptable for a couple of hours and given winter you will get only a couple of hours even in a South facing window. I have kept multiple Monstera and Philodendron in a South facing window since December and I did not experienced any burning.

When it was exceptionally sunny I closed the curtains to provide some filtering. I live in Central Europe for reference.

Now as spring comes the plants are still in the window and so far so good. But I have noticed that the pots start to dry out much much faster. This is a definite sign that the plants and the pots are getting more sun light and it is time to move them back away from the window before they get burnt.

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