Meet Subchapter-M compliance requirements with an Emergency LED Driver 15-Watt Constant Output Power. This 3-Hr LED Battery Backup can be used with most LED loads that have a rated voltage of 25-48Vdc. These emergency driver have been evaluated to and found compliant to UL 924. The emergency pack assembly is accepted as a component of a luminaire where the suitability of the combination shall be determined by UL.