... warranty 4, lifespan: 50,000 hours LED Driver external Specification: Model No. HG-LD-D Power 9~28W Forward Current 0.1 ... Voltage AC100~240VAC Output Voltage 27~42VDC Power Factor 0.9 Efficiency 87%Applications led downlight power, led panel Features:1)80~90% energy ... Environmen is -20~60degree Celsius, body temp. less than 538) LED life span: 30, 000Hours(Edison); 50, 000 Hours(Cree)Applications ...