I question whether the power saved really offsets the resources wasted on printing that note.
So average cost of paper manufacture + toner + printing + computer time to make it + tape vs what could well be nice LED lighting (white balance of that picture is probably not to be trusted but I tend not to see that kind of light from tungsten or CFL) possibly balanced by lifetime losses in cost of replacement.
If a timer would not do lest someone with an epic case of the squirts be left in the dark (as a furtherance to the studies mentioned above that particular category hates it even more than the others) I suppose we would also have to contemplate the installation of a PIR/alarm type sensor to trigger it.