I use the stylus almost every day in the hospital. Just as bright as a standard penlight that your doc or nurse uses for checking your eyes nose and throat. Now stick out your tounge and say 'aah'. /ubbthreads/images/graemlins/tongue.gif
I've found AAAAs at Radio Shack, but don't worry about prices. I've only had to change my batts once in the year and a half I've had it.
I believe brightguy.com had some good prices...$14.25 for white LED/silver body and $5.35 for a pack of 6 batts. The glare protector is also a good investment as it doubles to protect the LED from severe scratching.
Not super bright, but good enough for most uses, and a good white color. I like the twist on/pushbutton feature. In all it's a good light that to most people doesn't even look like a light.
/ubbthreads/images/graemlins/thumbsup.gif