Letters that can be easily mounted. The internal lighting source illuminate the front Acrylic Face of the sign with LEDs. These letters come standard with your choice of size and acrylic face.Are also known as double lit channel letters. Letters can be easily mounted. The internal lighting source of LEDs illuminate the front Acrylic Face of the sign which then reflects back through the clear backing to give the halo effect. These letters come standard with your choice of acrylic face, halo effect and all material colors.