plasma lamp

noun2

1. •
   A kind of gas-discharge lamp: a clear glass container, often an orb, filled with a mixture of various noble gases at low pressure, and driven by high frequency alternating current at high voltage.
2. •
   A type of electrodeless gas-discharge lamp energized by radio frequency.

   • The conversion of energy into light is more efficient in the high density plasma devices than in the low density plasma lamps. — 2001