I don't think that will give you the outcome your looking for. The motion node is not set to send commands so it won't do anything accept when triggered by sunrise or sunset.
If I was doing it I would use 2 sequences. One to control the lights triggered by sunrise/set . Then a second one triggered by motion, then run it thru a time check if between rise/set go to 100% give timer and then go back to 25%. (or whatever it was).
When you get it, add it to the Node sharing theard for others to use, sounds like a good one.
If you still have trouble LKM and I can throw something together I think will work.
EDIT: This one is close just add the time node after your motion, remove the light check (since it is between the correct times you don't need it), and it should work fine
