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Change your HPS lamps every 2-3 crop cycles.
HID (High Intensity Discharge) Grow Lamps fall into two categories, you have HPS Sodium lamps that can be used for veging and flowering or there are MH Metal Halide lamps that are only used for veging. Both varieties are available in 250, 400, 600 or 1000 watt versions and will need a suitable ballast to operate (ie. 600 watt bulb needs a 600 watt ballast).