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Protopia Metal Halide 6K lamp is the best for the vegetative stage of growth.The MH 6K lamp emits cool blue lights, matching the color of sunlight during spring. This part of the spectrum encourages short bushy growth and tight internodal spacing in plants. Performance Data Lamp Wattage (W): 400 Light output ( Lumens @ 100hours): 36000 Lumens per Watt (lm/W): 90 Rated life (Hours @ 10 hour/ start): 10000 Correlated Color Temperature (K): 6000 Color Rendering Index (CRI) or (Ra): 70 Photon flux (μmol/s): 500 Burning Position: HOR±15°