the microcontroller 170 returns to u201c state 0 u201d and the color wheel 38 stops rotating in this way a user can choose a desired hue of light and cause the light fixture to halt state output wait for and then 0 none stopped u201c off u201d then u201c on u201d go to u201c state 1 u201d 1 fast stepping to a predetermined go to u201c state 2 u201d index point and then stop period of time from last u201c on u201d 2 slow stepping u201c off u201d then u201c on u201d go to u201c state 0 u201d as mentioned above if at any time the power to transformer 52 is interrupted for longer than 4 seconds the 5 volt output 128 will go to 0 volts and when reengaged the microcontroller 170 will be reset to u201c state 0 u201d thus a user may select a position for the color wheels of one or more lighting fixtures that produces a desired hue of light and then turn off the lights at the source when the source power is restored the color wheels will remain stationary and the light will remain the chosen hue likewise an unintentional interruption of source power such as a power outage will not cause the selected hue to change it should be appreciated that multiple light fixtures will step at precisely the same rate as long as they are connected to the same source of power this is because the microcontroller 170 generates output signals at gp 4 and gp 5 that step a grey code to the driver circuit 200 once for every n sine wave transitions of the alternating current supply voltage n is a number determined by the microcontroller 170 depending.