A new type of LED device with brightness equivalent to incandescent lamp and fluorescent lamp

Matsushita has developed 60W incandescent lamp brightness and color, quite comparable to a fluorescent lamp lighting device LED "MFORCE" (Figure 1. Release information. First of all, will be applied to the lighting used in shops, from October 2006 onwards. Remove the power supply outside the whole thickness of only about 10mm, is a can be mounted directly to the lamp on the ceiling, the ceiling lamp looks like is embedded as (Figure 2). The price is about 10 times as much as that of the old LED lighting.

Figure 1: the middle is the use of "MFORCE" lighting equipment. On the left side of the incandescent lamp, the right is the use of old-fashioned LED lighting equipment.

When installed on the lighting, the brightness is about 600LM, basically the same as that of the 60W incandescent lamp (about 630lm). When using the company's old LED brightness is about 250lm. The power consumption of the entire lighting device is the same as that of the old one, about 17W. The power consumption of the existing spherical fluorescent lamp is about 13W, the compact fluorescent lamp, said Matsushita LED - special products - new market development center LED business promotion department minister Kimura Takashi: "from 2008 to 2010 and will catch up with or exceed the fluorescent lamp."

The efficiency of the lighting equipment has increased to about 2.5 times that of the Matsushita Electric products. As a unit of lighting equipment to enter the power of the brightness that is, the overall efficiency of about 35lm, equivalent to 3 times the use of incandescent lighting equipment. In order to improve the efficiency, not only the power loss is reduced to half of the old products, but also the development of a higher efficiency of the LED chip and the aging of fluorescent materials.

As for the color rendering, the average color rendering index (Ra) is as high as 90. On the blue LED chip with green and red fluorescent material, can make Ra close to 100 of natural light. Matsushita Electrical products are usually used in the blue chip LED yellow fluorescent material to form a white light, due to the small red and green components, so only about 80 Ra.

High heat dissipation is the key to achieve miniaturization and high output

To provide the LED chip to the floor and the main body of the heat dissipation of the lighting device, the thermal resistance from the past 40 /W to (/W) is one of the main reasons for the miniaturization and high output of the lighting device (Figure 3). The radiating device can be omitted, thus realizing the miniaturization of the main body of the lighting device. In addition, because the luminous efficiency of the LED chip can be controlled by heating, the brightness of the LED chip can be increased, thereby increasing the brightness of the chip. Without the use of ceramic substrate, the LED chip is packaged on a copper substrate by a thermal insulating substrate. The copper substrate is the use of insulation adhesive film, installed in the main body of the aluminum lighting equipment, through this layer of insulation film effectively spread the heat of the copper substrate. The conversion efficiency from AC to DC is 82 ~ 83%.

Package shape has also been changed. The structure of LED chip is covered by lens and fluorescent material. The method used in the past is to use the motherboard to send some of the light emitted by the LED chip to the front of the LED. In this product, the light emitted by the LED chip directly through the lens to the outside. Because the length of the optical path is uniform, the generation of the stain is suppressed.

Figure 2: the thickness of the lighting device is about 10mm. Since there is a part of the electrical connector, it is necessary to install the ceiling to a height of about 20mm. Figure 3: by reducing the thermal resistance to the original 1/8, the realization of miniaturization and high output.