The code was written by me on a Arduino Mega 2560. I picked this one because it’d adequate PWM output signals.
I’m using the PWM output signals on the Arduino to change 2N7000 mosfets that are linked to the LED strips.
For greatest brightness computation I used a straightforward LDR (photoresistor) to quantify lux degrees.
For dimming during ‘always ON’ mode I use a 5K potentiometer (variable resistor).
Changing modes is done using a multi-location knob switch.

Lots of tidying up, and after a great deal of wiring needed to be done.