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What are Mercury Vapor Lamps?

  Mercury vapor lamps are HID lamps that operate by arcing electricity through mercury vapor. This is the oldest type of HID lamp. 

Can Mercury Vapor Lamps Be Used for Horticulture?

  Growers who use HID lamps for cultivation do not use mercury vapor lamps. First, these lights are significantly less efficient than MH and HPS bulbs. Second, they do not produce a light spectrum that is favorable for plant growth.