  SUN SYSTEMS - COMPLETE SYSTEMSToday, the most widely used lights for professional indoor flower and vegetable growing are HPS (high pressure sodium) and MH (metal halide). These are types of HID or high-intensity discharge lamps. MH is used for vegetative phase of growth, as it encourages short internodes (distance between sets of leaves), and inhibits cell elongation, creating a shorter, stockier plant. Unlike high pressure sodium lamps, metal halide lamps also produce ultraviolet radiation, which may play a role in increasing the amount of flowers produced by the plant. High pressure sodium lamps trigger a greater flowering response in the plant and are thus used for the for the second (or reproductive) phase of the growth, or they are used by those people who only wish to purchase 1 single lamp. If high pressure sodium lamps are used for the vegetative phase, plants will usually grow slightly more quickly, but will also have longer internodes, and may be taller.
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