Although the advantage of using LED light bulbs is “Saving Energy”; its current market price and energy-saving effect still cannot compete with the compact fluorescent lamp’s. Yet, if the luminous efficiency of LED light bulbs can reach 80 lumens and its price can decrease by 40%, the cost of LED light bulb can catch up with that of the compact fluorescent lamp. In terms of the current production process of LED manufacturers, the demand of LED light bulbs will probably dramatically increase by 2010.
Also, for the LED light bulbs to replace the compact fluorescent lamp, and become the main household lighting source, aside from its brightness and cost, the “color temperature” will be the critical point to consider about. In terms of the household light bulbs, since the color temperatures of them range from 2500 to 3500K, it brings about a warm interior-feeling. However, because of the limitation of the phosphor, the luminous efficacy of warm white LED is 80% of cold white LED, where the color temperature is around 6,000k. Therefore, if LEDs are set to become the household lighting source, the luminous efficiency of the warm white LED should be increased to 100 (LM/W).
