In October 1999, SAE International formed a Cooperative Research Program with OEMs and suppliers to better understand the effects and limitations of 42 volt electrical system architecture on vehicle exterior and interior lighting systems. The project focused in particular on obtaining test information on the effect of Pulse Width Modulation (PWM) on incandescent lamp life, vibration resistance, audible noise, light rise up time, and arc-over resistance. This research report documents the findings of this Cooperative Research Program.

The work covered in this report reflects the group's work to date which has focused on Pulse Width Modulation (PWM) control of 12V incandescent (filament) lamps from a 42V supply (the nominal voltage of a vehicle with a 36V battery under charge). This report is the compilation of several "mini reports". Each test section includes methodology, analysis, results, discussion and detailed conclusions.

Chapters include: