As noted, the MCU 49 controls the other light source 18, if included, via an appropriate source driver 45. For most conventional white light sources, the driver 45 simply turns ON/OFF the source 18 and may set an intensity level for the source output, in response to a command from the MCU 49. The control routine implemented via the programming of the MCU 49 would account for the inclusion of light from source 18 at any given intensity setting, as part of its overall control of the fixture output including chaotic functional variations. The MCU 49 may control the source 18 via the driver 45 as part of the variations. In other configurations, the MCU 49 may leave the driver 45 in a state so that source 18 provides a fairly steady output over time and implement the variations like those discussed earlier via control of the LEDs 17 via the converters 47R-G and the drivers 43R-G.

The MCU 49 in the example of the light fixture 14 is a microchip device that incorporates a processor serving as the programmable central processing unit (CPU) 51 of the MCU and thus of the light fixture 14. The MCU 49 also includes one or more memories 53 accessible to the CPU 51. The memory or memories 53 store executable programming for the CPU 51 as well as data for processing by or resulting from processing of the CPU 51. The CPU implements the program to process data in the desired manner and thereby generate desired control outputs, for example, to control the other elements of the fixture 14 to implement the general lighting application with chaotic function control as discussed herein.