This lighting ring is designed for 18 white LEDs.
To be mounted on a 2200W VFD spindle for a milling machine (80 mm overall diameter and 63 mm mounting location).
With 12V power supply, group LEDs by 3 units in series wiring and use an additional 100 ohms resistor to achieve 20 mA current.
Finished with hot glue gun for tightness.
Full design available on Thingiverse.