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Which method for creating white light is best?

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The advantages and disadvantages of each method of creating white light are listed in Table 1.

Table 1. Relative advantages and disadvantages of methods for creating white light with LEDs.
Mixed-color white LEDs Phosphor-converted white LEDs

  • higher overall luminous efficacy
  • good color rendering properties
  • complete flexibility for achieving any desired color property

  • results in a single, compact, white light source

  • difficult to completely mix light
  • difficult to maintain color stability over life and at different operating conditions, including dimming

  • lower overall luminous efficacy
  • uniform application of phosphor in manufacturing process is more difficult to control
  • limited range of available color properties based on phosphor availability