"...Illuminated sign is a sign which has characters, letters, designs or outline illuminated by electric lights or luminous tubes on, within or attached to the sign, or illuminated by a removed light source. (Ord. 1096 § 2 (part); January 17, 1977)..."
http://www.burlingame.org/codes/TITLE 22.htm

"Illuminated Signs & Displays: Signs or displays using light in any form."
http://www.thescreen.org/htms/glossary.htm

"Illuminated sign: A sign that emits or reflects light from either an internal (electric) source or external floodlights. "
http://www.gablesigns.com/glossary/i.html