How to supply power to a rotating lamp?

StarPer4ik asks:

As part of a large project, a luminaire was required that slowly rotated continuously around a vertical axis. Light sources must be in the luminaire housing, switching alternately from the time relay. Everything will look approximately like in the picture. Question: HOW TO APPLY VOLTAGE TO A ROTATING LAMP? After all, the cable will twist tight tight for a few turns.
Lamp sketch

 

The answer to the question:
An interesting project and task! A competent solution would be to apply through the brush assembly and rings, however, I would recommend implementing this at 12 volts. By the way, rings and brushes can be taken from a car generator, as well as a shaft for their installation - we can say a ready-made solution!

In this case, the entire switching circuit of the lamps is reasonably located in the rotating part of the housing, and only supply power. I hope I understood your question correctly and suggested a useful idea, thanks!

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