Brighten light on motion?

Hello - I have a LIFX bulb in my front porch, which is controlled by smartthings and operates automatically (@ 15% brightness) as a dusk-dawn light. I have bought a zigbee motion sensor, and would like to raise the brightness of the bulb on detection of motion to 100%, and then reduce a few minutes later to 15%.
Try as I might, I can’t figure out how to do this in the smartthings app. For clarity, I don’t want the light to switch on on motion, unless it is already lit because the dusk-dawn schedule is active.
I hope that makes sense!
Many thanks for any advice in advance.

See below. You will need change the routine dim with motion.

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