Fluorescent Lamps UPSC NOTE


  • The value 6,500K marked on fluorescent lamps represents a parameter called correlated colour temperature. 

  • It means that the spectral, or light, colour distribution from that lamp is similar to that of a black body at that temperature.

  • Any black body when heated emits different colours at different temperatures.

  •  At 2,000K it emits red light, at 4,000K it is yellowish white; at 2,700K, it provides warm light; and at 6,500K, it gives the impression of cool daylight. 

  • Based on colour appearance, fluorescent tubes are classified into three types: daylight white (above 5,000K), neutral white (4,000K), and warm white (below 3,300K).

  • The colour of light depends on the fluorescent coating inside the tube. Three types of coatings are generally given: tri-phosphor, standard phosphor, and multi-phosphor.

  • Tri-phosphor coated lamps, like incandescent lamps, emit yellow light similar to sunlight.

  • Standard tube lights render a colour similar to daylight.



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Learnerz IAS | Concept oriented UPSC Classes in Malayalam: Fluorescent Lamps UPSC NOTE
Fluorescent Lamps UPSC NOTE
Learnerz IAS | Concept oriented UPSC Classes in Malayalam
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