The d5 constant current driver goes beyond simplicity and durability to also deliver exceptional control and LED protection features. The d5 driver series also has the ability to dim via analog (0-10V) and digital signals (PWM). The brightness of a luminaire containing a d5 driver can also be set without any external controls. The brightness can be set in 10% increments simply by switching the luminaire on/off in a pre-defined pattern. There is no need to open the luminaire or set DIP switches. All luminaires containing a d5 driver on the same circuit can be programmed at once. Alternatively, the factory can pre-program the brightness.