Indoor Overwintering

[Walentyne]

Dear Forumers,

I'm sure it is not the first time this question is asked here but I am looking for advice on how to best overwinter my my lemon, kumquat, limequat and orange trees. They are all bearibg fruit and have started ripening recently.

They were all moved 2 days ago to a cellar like space without any light on about 42 Farenheit currently but it is not guaranteed it won't go below freezing point later in the winter. I'm also concerned about the 0 lighr in the space. Somebody told me they will start sheddind leaves in complete darkness.
Because of this, I am wondering if I should bring them indoor. I have an unused bright room.where I can keep them between 62 and 68 Farenheit. Here I could also provide supplementary full spectrum lighting. I've read that the warmer you keep a citrus during winter the more light you need to give them. Is that valid? Or should I rather leave them in the dark cellar?
Finally, what about humidity? Should the cellar be dry or more humid?

I appreciste your responses in advance.

With love from Hungary, Europe.

[kumin]

Yes, warmer air temperature requires a higher light level. Total darkness may also promote fungal disease.

[Millet]

Citrus trees can be placed in the dark over winter if the temperatures are kept low.  The kings of Europe often put their citrus trees in the basement for winter storage.  However, your trees will do better in a warm and good lighted location.

[eggeto]

humid area,
scale, mites ... don't like humidity

[dytandme]

I keep most of mine in the warmer parts of the house. I've had great results with LED shop lights or flood lights. Typically, I run about 130w of lighting per square meter of space. That's true power output, not what US advertisers would incorrectly call "130w equivalent". In a room that cycles from 70-80*F and 40-60% humidity, I get flowers and harvest fruit through the winter.

The other citrus and figs I keep in a damp basement that typically hovers around 30-40*F only see ~50w per square meter in LED lighting. Lemons and limes do defoliate to some degree in those conditions overwinter, but bud up beautifully and bounce back come spring. The wild thing is, calamondin will actually continue to ripen fruit in these conditions.