Cree of the United States began production of the white LED "Xlamp MPL EasyWhite", which has a luminous flux of at least 900 lm at an input power of 11.3W. When the input power is at most 22W, the luminous flux exceeds 1000 lm. The package area is 13.15mm × 12.15mm. According to Cree, as a white LED with a luminous flux of more than 1000 lm, the package area is at a minimum level. Currently, Arrow UEC Japan, which is responsible for Cree's daily sales business, has begun selling Xlamp MPL EasyWhite.
Xlamp MPL EasyWhite has a model with a color temperature of 4000K and a model with a color temperature of 2700K. According to the brightness, the two products have two grades respectively. In terms of luminous flux, the 4000K product has a minimum of 900 lm and a minimum of 800 lm when the input power is 11.3 W; the 2700K product has a minimum of 800 lm and a minimum of 700 lm under the same conditions. According to Cree, the current flowing through the power supply is 11.3W is 450mA. If the current is increased to 600mA, the luminous flux can be increased to about 1.2 times. If the current is further increased to 750mA (the power is equivalent to 19.9W), then The luminous flux is further increased by about 1.1 times. If the luminous flux is the minimum model of 900 lm when the 11.3 W power supply is turned on, the equivalent of the luminous flux is close to 1200 lm when the 19.9 W power supply is turned on. In terms of sample price, the model with a color temperature of 4000K, a luminous flux of 900 lm is 3,000 yen, a color temperature of 2700K, and a luminous flux of 700 lm is 2,500 yen.
Cree wants to replace the halogen lamps used in Spot Lights such as shops with new products. By reducing the package area of ​​the product, it can be easily applied to, for example, a spotlight that has been using an MR16 type halogen lamp. According to Cree, “the luminous flux obtained from the previous use of 5 to 6 white LEDs is sufficient for only one product with this product†(Araki Ichikawa, Business Development Manager, New Product Group, Arrow UEC Japan). Cree also emphasizes that in the past, when multiple white LEDs were used, the color temperature and luminous flux of each white LED were different from each other. In contrast, since the white LED is used alone, the deviation problem can be solved. The company plans to provide not only white LEDs, but also drive circuits, printed circuit boards and lenses to provide lighting solutions to manufacturers.
Package 24 Middle Size Chips
To achieve greater luminous flux in smaller package sizes, Cree reduced the thermal resistance of white LEDs and packaged 24 blue LED chips. According to reports, the thermal resistance of the new product is 3 ° C / W, and the white LED of other companies that can obtain hundreds of lm of luminous flux is 6 ~ 10 ° C / W, compared to the thermal resistance of the new product is more than half. Although the method of lowering the thermal resistance has not been disclosed, it seems that the appearance of the package is a ceramic substrate.
The blue LED chip packaged in the white LED is a product called the Size Size. According to Cree, this is between a size of about 300μm square called a standard size and a size of 1mm square called a large size. It also has the advantage of high light efficiency in standard size and a large size unit chip. It can produce the advantage of a large luminous flux. Each of the blue LED chips was coated with a yellow phosphor, thereby obtaining white light. The luminescence spectrum of the entire package is a superposition of the luminescence spectra of the 24 LED chips. If some of the 24 LED chips have different luminescence spectra from others, since there are 24 overall superpositions, the luminescence spectra do not vary greatly, and as a result, the color temperature deviation between packages is reduced. In addition, 24 blue LED chips are connected in such a manner that eight are connected in series in one column and three in parallel. (Editor: maysoong)
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