Hitachi Appliances Inc has announced to develop world’s first E26-base wide-light-distribution-type LED light bulb, "LDA15D-G," which can emits the amount of light equivalent to that of a 100W incandescent light bulb (1,520lm). The new bulb is to be released on July 13, 2012, in Japan.
According to the company, it realized the amount of light and a wide light distribution angle like the light of an incandescent light bulb by employing a high-efficiency LED module, the "Slit Structured Body," whose slit has an about 1.3 times wider radiation area than the slit of the company's existing product to efficiently release heat generated by the LED module and the "Light Diffusion Cover," which widely diffuses LED light and reduces the unevenness of the light transmitted through the cover.
Compared with a 100W incandescent lamp, the power consumption and rated product life of the new bulb are about 1/6 and 40 times longer (40,000 hours), respectively. With a power consumption as low as 15.0W, the LED light bulb can replace a 60W or 40W incandescent lamp. With its protective function, the LDA15D-G automatically lowers its temperature (and brightness) when the temperature or humidity becomes high. Therefore, it can be used for closed appliances.
But it also has limitations. For example, it cannot be used outdoors and does not support dimming control systems. Also, because it has an external diameter of 60mm and a total length of 123mm and is larger than a 100W incandescent lamp, it probably cannot be used for some appliances.
Additionally, the company will also release an E26-base wide-light-distribution-type LED light bulb, "LDA15L-G," whose brightness is equivalent to that of a 80W incandescent lamp (1,160lm) on the same day.