Interesting.
But let me clarify. What I want is a light outside the door entering the shop. If the shelf is down and the door would hit in when opening, the light would shine (red warning light indicating do not enter, or don't open door much if you do.)
This is not to control the two LED strip lights that I have shown. They work quite well, actually, with motion detectors built in. Not exactly as bright as the sun, but they do help.
This is a picture from outside the door, opening it:
Attachment 515047
In this case the shelf is higher than the door, so feel free to enter (assuming you know the door code, leave a DNA sample, retina scan, and 23andme check of your family.)