I am waiting for the Paper-white 2nd generation. As I already have 2 Kindle 3 and a Sony Reader
I have the Kindle 3 with the official light and it is not that bright, awkward and will lower the overall (battery) life of the K3.
For night time I prefer the delicious
Daffodil ULT180W USB LED Lamp
with 18 Bright LED Bulbs, Magnifying Glass and Flexible Gooseneck / Plugs into Your PC or Mac's USB to Light-up its Keyboard and Screen/ Dual Powered: No Batteries Needed While Connected to USB and Can Also Be Powered by 3 x AAA Batteries (Not Included).
cost is £4-15
Which uses a very strong white light that is a pleasure to read.