ECEMBER 4, 2012？UL 1993 tr1 UL Standard for Safety for Self-Ballasted Lamps and Lamp Adapters, UL 1993 Fourth Edition, Dated December 4, 2012 Summary of Topics This new edition of ANSI/UL 1993, the harmonized ANCE, CSA, and UL Standard for Self- Ballasted Lamps and Lamp Adapters, includes the following major changes: a) Miscellaneous corrections and revised marking section; b) Clarify use of polymeric materials in 5.3.1; c) Change of end product requirement to mat