Well I'm 56 but judging from a lot of the posts here I think I use less light than most or at least than many. I keep my Voyager set low between 10 and 12. The brighter light just causes glare and makes the text show less contrast, to my eyes that is. The tradeoff is that the screen is darker with lower light levels. So when I get the light as bright as I can without causing too much glare, in other words where it is a comfortable reading level, the screen is a bit too dark and the blue tint is very obvious.