Maverick Sun LU400DLUX   Dlux LU400-D Lux Digital 400 Watt HPS Grow Lamp Bulb E39-ED18 (Discontinued by Manufacturer) Approximately 56,200 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 56, 200 initial lumens; 12, 000 expected life hours; E39 base; Ed18 bulb; color 2200k