Good day all. I was on a service call Monday and came upon something I haven't seen. At an auto-body shop in the paint booth the owner replaced all but one of his F40T12 lamps with F40T10 lamps. The one 4 lamp dual-ballast luminaire had 3 T10 lamps and 1 T12 lamp that was pink in color. I ended up replacing one of the T12 ballast with a T10/T12 ballast. Everything was fine until today. Two different lamps are out. Called a few suppliers with no resonse yet. Can T10 lamps be used with T12 ballast? Thanks in advance, and what a great place to go for help.