Comment by ganz on My simple hack for increased alertness and improved cognitive functioning: very bright light · 2013-01-19T10:48:15.405Z · LW · GW

I found a cheap lux meter helpful in convincing myself to actually make a change in my lighting. I moved my workspace lighting from 130lux at my desk to 500lux , and have found it easier to stay alert in the evenings.

I believe it also improved my ability to judge indoor lighting levels, but haven't tested this.