It's just a Line of LEDs, which you can fix inside the rear Panel. Just screw 'em off and put it in. Those LEDs are available round 15- 20€ a pair. I'm now on my way to buy another pair for I would like to make the Cab shine, too. Since my last concert ( look at the Users gallery) where you could See the Stack hardly on stage, I would like to enlight my Set, so the audience may see, who' s the Star on Stage.... EINSTEIN!