I don't like the color of LED lights, it's too blue and harsh to me. I got an Ott light and have that aimed at my sewing bed. It's a little awkward and kind of blocks some of the buttons on my machine but the more natural wavelength light makes my eyes happy. (I have the 6600 too)
I have this one:
http://www.amazon.com/Ott-lite-Ott-L...5566510&sr=8-2 (but I bought mine at Joann's on sale).