We have been using the Lumos Knitting Light for a while, and we love it!  It is extremely lightweight and very flexible.  

From the company, Lumos & Lumos:

• prevents eyestrain and migraines
• eliminates back and neck pain
• easy on the eyes with 3 different color temperatures
• infinitely adjustable brightness
• weighs just 3.4 ounces
• rechargeable - charges in 2 hours and last 8 hours on a charge

Also, the box comes with an Albus Dumbledore quote!