About 10 or more years ago, I designed and built a rotary device with leds, . One small fan with an axis that had atached a bar of leds. I solved the problem of electricity transmisión over a rotation axis, studying the concept of what in english is named "slip ring", so I basically build one from scratch with 2 ball bearings..., one for the positive , and other to the negative, that were inserted in the rotating axis.., .I used the old Little leds that existed that time...It worked!!! but All has to be very well calibrated, cause the rotation speed maked all inestable...those were great times...
Hope you understand the concept