Programming two sequences into one MCU is not that hard, and there is plenty of help here.
Using Cat-6 for the Cree LEDs could also save you some money for power. 1.5mm for <1Amp is overkill.
Why did you connect D10 and D11 to the LED drivers.
Reading the internal register will always return for you what the controller is trying to put on the pin, not the actual pin value.
@raschemmel, need to check what that is
So i have free pins on the PCA9685 and it is 12-bit maybe it would be better to also connect the shower lights PT4115 to him.The Problem is i am really scared about the code. I never did something I2C and want to control dimming with one button.