I just changed mine from 1pm to 9pm. The timer is running my ballast for my 2 vhos and my ballast for my 250 metal halide. Although I think my timer is not built to run two ballast. So at this point I have not figured out a way to run my vhos and metal halide at different time intervals.
On my 20L I ran actinics only for 2 hours, then added on the 10k bulb for 7 hours, then finished with 2 more hours of actinic only. That always seemed to be the best pattern for the tank, but I didn't observe all that closely.
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