Wicked, yeah I actually got them second hand but basically not used. Thats what he said to do, just wanted to double check. Any chance you could explain the reason for this at all as its good to know why. Thanks alot man.
Metal Halide (abbreviated MH)
Metal halide lighting systems are excellent for use in the vegetative phase of growing. They emit a lot of blue light, which encourages vigorous growth of foliage. They have good efficiency, but can be rather expensive to get started with; fluorescents may seem more appealing because of their lower price, but they are not much different when compared on a lumen-to-lumen cost level. These lights can be used for the duration of a grow, but will most likely result in light, fluffy buds.
High Pressure Sodium (abbreviated HPS)
High pressure sodium lamps emit mostly orange, yellow, and red light, which is ideal for the flowering stage of plant growth. They are generally the most efficient type of light available for any application, barring an extremely high efficiency LED, which I won't even discuss because of their extremely high cost. HPS lights can be used for the duration of a grow. While the plants do take longer to mature and be ready for flowering than with a metal halide light, they produce much more dense and usually larger buds.
HPS lights are generally more expensive than MH or MV systems of similar wattage. They are also the most efficient, and most widely used by experienced growers for their emitted spectrum and efficiency.
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