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How strong should lighting be on citrus indoors?

Heruga (7a Northern NJ)
last year
last modified: last year

Indoors during the winter only. In the past years I had these trees, I’ve never used any supplemental lighting and I suspect that is the reason why my mandarin is stressed and gets some scale. They also haven’t fruited properly(flowers alot though) for a couple years.

This room is south facing but as you can see the trees are already taller than the window so it doesn’t get adequate sunlight especially on the top part of the tree. How many watts should supplemental lighting be? I hear anywhere from 400 to 1000 w. The whole floor will not have any heat turned on over the winter so it will stay pretty cool(45-60 F) so maybe light requirements change with that.

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