I've even gone so far as to take a bolt of fabric outside to match it to a paint chip. It was a green that just wouldn't behave in the store. So the staff allowed me to take it outside! They got the sale - enough fabric for curtains.
I don't have an OTT light, but in my sewing studio, I have natural flourescent lights and love them. My new machine also has 5 lights built in and it's great.