Bedtime Reading

I will need a good reading light for my Kindle when I read at night. Once it arrives I shall order the night-light at a cost just under $20.
Product Description

"The Mighty Bright XtraFlex2 Light is a battery operated clamp-on accessory that is custom designed to illuminate your Kindle Wireless Reading device. Two Super LED lights in one head gives you the lighting power of 6 normal LEDs. You have the option of using one or two of the Super LED lights with just a simple tap of the proprietary sensor switch. The flexible neck allows you to position your lighting anywhere you want it. With the XtraFlex2, you can take your Kindle anywhere--in bed, on the bus or train, and have proper illumination at your fingertips."

The lens of this light eliminates the 'hot spots' seen with other reading light devices. I am looking forward to using this item. I wonder how often I will need to change its battery.