Maverick Sun Dlux MH600-D Lux Digital 600 Watt MH Grow Lamp E39-BT37 Approximately 65,000 initial lumens Approximately 12,000 expected life hours E39 base These horticultural spectrum lamps are unsurpassed by any brand of lamps HPS D Lux Lamps are approved for both magnetic and digital ballasts MH D Lux Digital are approved for digital ballasts only Our spectrum and lumen output are designed to maximize PAR values Approximately 65, 000 initial lumens, 12, 000 expected life hours, E39 base, Bt37 bulb, Color 4200k