I got a book talking about lighting for reading but I am on a business trip
staying in a hotel. Otherwise I will take a picture of the book and post it
here.
The book's title is "Interior Lighting" by Gary Gordon. The section that
talk about great light source for reading is around page 40. You probably
can find it in library.
The brightness is not the most important factor to reading light. Contrast
is more important. Rule one is the light source should not within the view
when you are reading books, desk lamp is usually not suitable for hours of
reading. Rule two is that nothing else has more contrast than the book
itself. Since most books has white background, dark colored table is a big
no no. If you want the kid use the same setup when later on for computer or
laptop. You probably want the wall to be whitish. No dark color hutche
either.
Rule three is no bright light directly on top of the head or slightly in
front of the head. It will reflect light on the book and cause strain on the
eyes.
We just remodeled our house. We put ceiling recess light on the two ends of
my son's table so that it hit middle of the table at 45 degree (he got a big
table). The design is exactly like Gary's book. I liked it so much. We
ended up have the contractor come back and did the same thing for both my
office and my husband's game room.