I Spy With My Eye

I am not sure if you know how bright your desk lamp is but apparently my mom was so concerned about my eyesight (please refer to my previous post) that she wrote an email to my optometrist.

Dr. Kuo:
I would like to know the following:
Charles read the book by using 25W lamp, I have a comment that it is not bright enough and maybe not good for eyes. Could you suggest what is the best (75W ?) for eyes when he read book near bed during night.

Another great email from my mom.  (For those that are still concerned, I upgraded my bulb to a 40W the other night. I was about to put in something higher, but the lamp instructions say it is a fire hazard.)