I have an aunt that is light sensitive, too. She is 54 and I am 47. When we went to retreat it really disturbed everyone that we turned all the lights out except our machine lights. We even gave our extra lights to other people. Worked out best for everyone.
But those Ott lights...those things are EVIL. Shudder just thinking of them!
I feel for anyone that can't see for whatever reason. Yesterday my husband moved my glasses while I was in the shower. I couldn't find them and had to get a spare pair out to find them because he left for work.