Electronic Ballast Capacitive Input Power Factor

Have a look at the Wikipedia article on this topic.

This is a very standard question repeated many times. I myself did make a capacitive electronic ballast - using simple copper choke and capacitor etc long ago. It gives capacitive impedance at the input. It causes very peaky current waveforms. Many did recommend that you put a inductive circuit with one tube + a second capacitive circuit tube in the same fixture- to make it net near pure resistive for fixture. We did sell a few capacitive ballasts. Field complaints were capacitive ballasts resulted in heavy sparking while turning on / off, and switch contacts got welded.

So there are many practically unacceptable issues and hence have not become popular- though solution exists.

The color spectrum of LED fixtures is controlled by changing the capacitance in the ballast circuit so I would say "yes".