This is my (turned-out to be not so trivial) realization of lighting for my Ender 3.
I bought these flexible USB powered LED lights for only about 2 Euro a piece.
With a knife a bust-opened and removed the USB connector to hook up directly to the wiring. It turned out that it was harder than I though. The wires were very fragile and I broke them during manipulation. In the end, I opened the whole light assembly (by pulling), then with 2mm drill I cleaned the residual resin at the beginning of the flex hose and replaced the wires by new, longer ones.
The rest of assembly went as intended. Carefully screw the flex hoses into the printed holder, solder wires and switch KCD11-101 together.
Before pushing the switch in, you need to first fix the holder to the frame using M4x8 screw + slot nut.
There are also 2 tiny holes from the sides for screwdrivers. for removal of the switch if needed in the future.
The second holder, for single light next to camera is to be used with my remix of camera mount.
The assembly steps are similar. Fixation with two M3x12 + nuts.
Easiest print orientation as in STL file.