Art of Light

No, this isn't one of those contemporary art displays using neon tubes. It's an unusual exhibition which combines 15th- and early 16th-century German stained-glass windows from the Victoria and Albert Museum with paintings from the same period in the National Gallery collection, enabling comparisons. Interesting, and my favourite price: free. You'll find Art of Light: German Renaissance Stained Glass in the National Gallery's Sunley Room from 7 November 2007 to 17 February 2008.