I grew tired of continually changing my Sun’s values of intensity and colour, so I added some drivers to the sun’s material and the HDRI World background. Here is the tutorial of how I did it, if anyone is interested:
Here is the link on my Website: http://www.clockmender.uk just go to the Tutorials Page.
Along with two images of the process in use:
Lowish Sun.
Very Low Sun.
You just move the sun up and down, Z axis, to get all the changes in colour and intensity, and move it in X and Y to light the object from different sides.
Cheers, Clock.