Seoul Semiconductor announced that it has succeeded in raising the efficiency of the world’s first AC-driven semiconductor lighting source, to 80 lm/W.
The company has made significant strides in a short time to improve and raise the level of performance of Acriche, the world's first semiconductor lighting source that can be directly connected to 110 V or 220 V a.c. outlets without the need for an AC-DC converter.
DC-driven LEDs have many disadvantages. While their lifespans are typically 50 000 to 100 000 hours, the AC-DC converters required for their application to lighting fixtures only have lifespans of 20 000 hours. The need to change the AC-DC converter several times over the life of the LED is a major shortcoming of DC-driven LED technology, and limits its appeal for lighting fixtures. AC-DC converters have several other shortcomings including:
* They add extra cost and require more space.
* Design difficulties to accommodate space and thermal dissipation requirements for DC-LEDs make it less viable as a replacement for conventional incandescent bulbs or building structure lighting.
* Waste materials from the converter causes environmental pollution.
* Since converters have less than 100% efficiency, they add to the energy loss of a system
* When applied to a small or enclosed area the LED and the AC/DC converter interaction can accumulate to massive heat causing a reduction in lifespan.
* Overheating can cause a fire concern which will require safety plans.
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