As of October 2003, OSRAM has improved the HSD 575/72 lamp by lowering the start voltage to 1.5 kV. This solves the compatibility problems with magnetic ballast fixtures that we wrote about in May. See http://www.martin.com/service/showpage.asp?id=2887.

Improved lamps have the following or higher batch codes:

  • C3a8
  • C3b8
  • C3c8

The HSD 575/72 provides an average service life of 3000 hours and and a color temperature of 7200K. We approve the improved version of lamp for use in the following fixtures.

  • Exterior 600
  • Exterior 600 Compact
  • MAC 500
  • MAC 600
  • MAC 600 NT
  • RoboScan Pro 918