Incandescent lamps are based on technology that was developed centuries ago. The lamps produce light by passing current through tungsten wire. The emission of rays are primarily in the infrared region as the working temperature of tungsten filaments is about 2700 K. These lamps are inexpensive, easy to use, and free of toxin components. The colour rendering properties of incandescent lamps are also good. This technology has been phased out or is under phase out program in majority of nations.

Key advantages:

  • Cheap and easy to install
  • Good colour rendering
  • Controls can be easily installed

Key disadvantages:

  • High heat loads
  • Low efficacy ( 5 to 15 lm/W)
  • Short lamp life (1000 h)
  • Supply voltage fluctuation could damage the equipment completely
  • High operational cost