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  • Less bright (50-70 lumens/watt)
  • High manufacturing costs. Hard to install. Requires specialized workforce.
  • High maintenance cost.
  • They generate high temperatures that can damage the lamp
  • Fluctuation in electric power can easily spoil SMD LED.
  • They are easily broken.
  • A failure in one of the LEDs can be transmitted to the other LEDs in the lamp
  • A damaged SMD LED shows an unwanted effect when observing the lamp
  • They have a small fixation surface, which means much less heat dissipation.
  • SMD LEDs can only emit unidirecional light, which is often insufficient.
  • They may irradiate some dangerous, non-light waves.
  • If they don't have attached a protection lens, they can blind the eyes for a moment.
  • They can't stand hits or shaking
  • They're affected by water and storms
  • Even if they are well protected, it's difficult to decrease adverse effects derivedfrom high temperature.
  • There may be changes in luminosity.
  • Changes in the wavelength.
  • Changes in brilliance and color of the light.






  • Much higher lighting efficiency, almost twice as much as SMD (120 lumens/watt).
  • Easy to install, doesn't require specialized workforce and has a lower maintenance cost.
  • It can withstand high temperatures.
  • It can bear great fluctuations in the electric force. They are rarely blown out.
  • They are hard and can resist hits, shakings and bad utilization
  • Their heat radiation is way lower than SMD LED's
  • Their manufacturing cost is lower, and thus, its price is getting cheaper
  • They don't need an electronic circuit to work, which vastly decreases breakdowns.
  • The whole COB panel emits light, so there are no "dead areas" as in the other LEDs
  • COB LEDs swiftly disipate the irradiated heat.
  • They emit multidirectional light.
  • The non-light waves that they emit are stable and small.
  • It doen't blind the eye, so the power of the lamps can be increased.
  • It withstands water and storms.

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