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Protopia Super High Pressure Sodium (HPS) lamps are the classic and most popular choice for flowering rooms. Protopia HPS lamps can be used through the vegetative and flowering stages, but the yellow spectral output makes them optimal for flowering. Performance DataLamp Wattage (W): 400 Light output ( Lumens @ 100hours): 56000 Lumens per Watt (lm/W): 140 Rated life (Hours @ 10 hour/ start): 24000 Correlated Color Temperature (K): 2000 Color Rendering Index (CRI) or (Ra): 25 Photon flux (μmol/s): 700 Burning Position: HOR±15°