Use micro-spot fixtures with 6-8° beam angles for works under 20cm, 8-10° for works 20-40cm. Position fixtures at appropriate throw distance to achieve desired beam diameter at artwork plane (e.g., 8° beam at 2m throw = 28cm spot). Use locking pan/tilt mechanisms to prevent drift. Specify smooth dimming for level adjustment between works. Consider optical framing accessories for rectangular works. Test with actual works before finalizing positions. Document positions for exhibition reinstallation.