Because the actual tolerances of the steps' bullnoses vary, some bullnoses had to be pulled out.
This small discrepancy in the step lights siting conditions is the second challenge we encounter with the lights.
The first challenge was the LED strip lights. They only can be cut in so many inches, while they do come in LV and 120v, the 120v options for precut sizes were few and of totally odd cuttable distances (14" or 42" but not the 30" we necessitated.
Someone suggested a Fixture light and I did not object to an angled down frosted glass black 4.5x8.5 design which still goes along to the somewhat Bauhauss/deco theme.
If you do the electrical connection and then screw the fixture to the wood, you will have a problem re-aligning the screwholes (into the side plywood) once the carpet goes in. To cut to the chase this is the way to go:
Cut hole and make sure fixture wil fit in aligned and levelled, then put fixture away.
Install carpet except where the bullnoses have been removed, leave the carpet "tongue" that goes over the bullnose loose pending final step, cutout carpet over fixture holes, do electrical connection, drill side holes on fixtures , secure fixtures, install bulbs, test lights, install covers, reattach bullnoses and secure carpeting over bullnose.
Hardly the 8 manhour job originally guestimated.