I just recently finished building my observation hive, I went ahead and built panels to cover the windows to keep the light out for whenever it wasn't in use. In my general reading and research, I got the impression that was universally accepted and Standard operating procedure.
However, I stumbled across this quote in a Research paper titled "The permanent observation hive"...
"Incidentally, I note that in the 30 years that I have managed observation hives, I have always kept them in
a lighted room, either from a window or artificial light from a bulb, always shielding them from direct
sunlight. I have never seen any evidence that exposure to light stops the hive from functioning normally.
It is true that bees are extremely phototropic, and that if you suddenly raise a window shade they will all,
in one collective movement, move towards the source of light. But, after a while, once the source is a
constant part of their environment, they will soon resume normal behavior."
Here's a link to the full article, the above quote is from page 11. http://www.classroomhives.org/wp-con...eff-Murray.pdf