HID (High Intensity Discharge) Grow Lamps fall into two categories, you have HPS Sodium lamps that can be used for vegetation and flowering or there are MH Metal Halide lamps that are only used for vegetation. Both varieties are available in 250, 400, 600 or 1000 watt versions and will need a suitable ballast to operate (i.e. 600 watt bulb needs a 600 watt ballast).
High quality and reliable Grow Lamps
All grow lamps sold at HydroHobby - we recommend you swap every 2 to 3 crop cycles to ensure you get the maximum from your MH or HID Lamp. We have top brands including Sunmaster, Gavita, Osram and more all will provide your plants with the lighting requirements they need to grow healthy and strong.