The Evolution of Light
Limitations of Conventional Plasmas

Limitations of Conventional Plasmas

Conventional macroscale plasmas, such as arc lamps, high-intensity discharge (HID) lamps and fluorescent lamps, are energy efficient and cost effective, but they also have some of the following limitations:

  • Electrodes must be far apart for high efficiency
  • Pressure inside the device must be low if electrodes are far apart
  • Lamps with low pressure inside, such as fluorescent, are fragile (vacuum)
  • Use Mercury because Mercury is necessary for high efficiency
  • Lifetime limited relative to new technologies
  • Available only as tubes or bulbs (poor utilization of light produced)
  • Requires bulky fixtures to direct the light, reducing overall efficiency
  • Multiple lamps are often necessary in each fixture
  • Usually emits heat, or heating is required for proper operation