Hi , thanks for review..
It works just as any stairs lighting controller, there is some amount of video on YouTube. By changing a source code for Arduino you can make illumination even better
The difference is that it can be easily connected to home controller.
What do you mean ' far too much load'..?
1.2 W @ 25 c this is not too much .. but enough for stairs lighting.
Let's say 1 m of any led strip per channel.
If overload it's better to have a fire extinguisher beside..
There no radiators attached to mosfets..