The bulb of a tungsten halogen lamp contains a gas and free halogens. Tungsten molecules migrate from the filament to the halogens and back to the filament (halogen cycle). This increases lamp life in comparison with ordinary incandescent lamps and also avoids bulb blackening.


  • Very good color rendition
  • Immediate "ignition"
  • Low price
  • No operating gear required


  • Low luminous output (13-25 lm/W)
  • Short lamp life (2,000h)
  • High thermal load