I knew a cleaner from a neighboring town that had a yellow revolving light mounted on his roof and wired to his TM. When ever the unit ran so did the light.
He said it was really noticeable when he cleaned at night and he did a lot of restaurants and thought it brought attention to his company.
It really depends on who you are and where you want to position yourself but the light was too much for us. I'd never seen that before or since.
Now a rotating light on your sign I would do without hesitation.
P.S.
I also know a guy that wears one of these when he cleans. Now I won't say his name, just in case its a trade secret.
Michael MICHAEL
Michael Mi
ch
ae
l MiChAeL!