Maybe, despite the name, it does need to be in a really well lit room. My hallway really does have borrowed light and the colour just always looks drab - perhaps it's better in an brighter, naturally lit space?
Well, DS room is south facing and is light and airy - 2 windows and high ceilings. The hallway only gets light from the two glass panels in our front door, as we have just had to put a fire door on the kitchen - blocking the light coming from the other end of the house.
We have just finished a loft conversion - which means we have a lot of decorating to do.
Borrowed Light is my new favourite colour. I painted DS's already blue room in it, and the rest of my family couldn't see the difference, but I love the subtleness of the colour. You could try the copy advised by amazonianwoman.
I've just done half our bedroom in borrowed light and ds wants it in his. Jury is out on the colour because it's dark now, but I've got through a lot of f&b in my time and never had problems with cleaning the modern emulsion
Our last house, which was quite a gloomy house, had bedrooms in f&b French gray which is a warm greyish blue.