Basement and strong light does not seem to match. How big is the window and in what direction is it located? South?

Without knowing I do think the light levels can be quite low... it though may feel high for the human eye as you come from a very dark basement to a room with a window. I would be carefull to buy plants before I measured the actual light intensity in the room.

I have a south-west large window in my livingroom on the second floor and I have problems growing high light demanding plants without extra light.