I think everyone jumped on your message because you started out by saying " I know this is horrible but...". It made it sound like you felt a little bit guilty is all. Anyway everyone DOES take care of their horses different ways. I have no issues with that and I wish in the showing world that a horse could win by being natural. We all know that doesnt happen anymore...sadly.
I do agree, however, to the comment made about the lights. First it does mess up the internal body clock, just like it would us. Horses need to have the darkness for rest, and body repair as we do. I don't know why any barn wouldnt think of this. Think about sleeping with your lights on 24/7....it seems like overkill. You should discuss this with your barn manager. I understand not wanting to grow excess coat-but the horses state of mind and the normal cycle of the day should be seriously considered. And it sounds like blanketing is covered so excess hair is at a minimum.