The lumii black lamp is a 600 w dual spectrum high pressure sodium lamp with e40 version. Perfect for the stimulation of flowering and growth, each light bulb offers 20,000 for best results, we recommend using a lumii or lumii black operating device. Although these lamps are manufactured according to an extremely high standard, the performance will fall off over time. We recommend replacing the lamps every 3 6 months to avoid reducing the harvest. Lamp size and output power: 600 watts, 88,000 lumens, e40 screw frame.