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LED Basics
LED Terms
LED History
LED Facts
LED Advantages
LED Limitations
LED Standards
LED Trends
NEC Hazard Zone Classifications
LED Limitations

  • High initial price: LEDs are currently more expensive, price per lumen, on an initial capital cost basis, than most conventional lighting technologies. As of 2010, the cost per thousand lumens (kilolumen) was about $18.
  • Temperature dependence: LED performance largely depends on the ambient temperature of the operating environment. An adequate heat sink is needed to maintain long life. .
  • Voltage sensitivity: LEDs must be supplied with the voltage above the threshold and a current below the rating.It require more precise current and heat management than compact fluorescent lamp
  • The most common symptom of LED (and diode laser) failure is the gradual lowering of light output and loss of efficiency. To quantitatively classify lifetime in a standardized manner it has been suggested to use the terms L75 and L50, which is the time it will take a given LED to reach 75% and 50% light output respectively
  • Light quality: Most cool-white LEDs have spectra that differ significantly from the sun or an incandescent light. It can cause the color of objects to be perceived differently under cool-white LED illumination than sunlight or incandescent sources


Lighting products  in the marketplace in 2010:**

Cost of products per light output

Incandescent Lamp (A19 60W high efficiency)   $0.5     per kilolumen
Compact Fluorescent Lamp (13W)   $2        per kilolumen
Compact Fluorescent Lamp (13W dimmable) $10      per kilolumen
Fluorescent Lamp and Ballast System (F32T8)      $4        per kilolumen
LED Lamp (A19 60W dimmable)   $50       per kilolumen
OLED Panel $2,560   per kilolumen


**Solid-State Lighting , Research and Development: Multi Year Program Plan by DOE 

* Reference: http://en.wikipedia.org/wiki/Light-emitting_diode,         http://www1.eere.energy.gov/buildings/ssl/ 

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