This describes a way to gives specific commands to your bulbs automatically at specific times.
This solution is by Greg Sax:
I used the Start in (optional) field in the Action section of Task Scheduler. After this was working I did some tinkering and figured I could combine the commands into one .bat file and the /C to close the window after running. It all works now so have set up the lights to turn off on a schedule.
StairLightOff.bat
start "c:\windows\system32" cmd.exe /C
start "D:_Downloads\Home Automation" LIFXcl.exe off D0-73-D5-00-98-18 D0-73-D5-00-98-18

Note (by Nate):
I don't have time to try it, but I guess you could also just in the "Edit Action" menu browse for the LIFXcl.exe, and under "Add arguments" enter all the arguments for example "off D0-73-D5-00-98-18 D0-73-D5-00-98-18".
However by using a .bat, you can execute multiple commands one after the other.