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The latest in lighting technology is the LEP – Light Emitting Plasma system, or “plasma lighting”. These lights are unique in that they have a very long bulb life – 30,000 hours, or about 7 years when used for 12 hours a day. While the initial price is higher than buying a separate ballast, hood, and bulb, you will see a return on your investment in the first few years since you don’t need to buy new bulbs. The spectrum provided by plasma grow lights is very close to that of sunlight. In addition, more UV light is emitted, which results in plants with denser structure – plants that produce essential oils generally produce more when exposed to UV light.