1. Also known as "LED ribbon," a narrow band of screen running around the circumference of an arena or stadium often used to display advertising.
http://www.insidearenas.com/western/StaplesCenter.htm
2. Light source often surrounding a camera's lens.
http://www.diyphotography.net/diy-macro-lighting-led-ring
http://www.insidearenas.com/western/StaplesCenter.htm
2. Light source often surrounding a camera's lens.
http://www.diyphotography.net/diy-macro-lighting-led-ring