QL4 QuarterLites are low energy lights using four high brightness Light Emitting Diodes.

They fit on to the back of the sign box and light is emitted sideways through 360° diffusing off the sides and back of the box to produce an even illumination on the front face.

The LEDs are mounted on a flexible PCB with a circuit shunt and connector and are thermally bonded to the aluminum heat sink to keep the light cool.