InGaN LEDs： A Question of Power

　　氮化鎵（GaN）的混合物和氮化銦（酒店）形成的氮化銦鎵（InGaN）已成為制造LED的比較流行的技術之一，特別是藍色和綠色。雖然技術的歷史可以追溯到上世紀90年代，大功率InGaN技術更近。

　　這個領域的可用產品可以應用到現代應用中，標準和高功率產品都有其優點和缺點。標準發光二極管的優點是更容易設計，以及更小，更便宜的高亮度對應。然而，一些應用，如街道照明和汽車頭燈，需要額外的權力。在這兩種用法之間仍有許多應用程序。

　　LED的色飽和、節能、長壽命是照明應用領域中發展最快的領域。白色和彩色發光二極管在建筑照明、娛樂、裝飾照明和視頻墻中有著廣泛的應用。紅色、綠色和藍色發光二極管由于其結合其他顏色的能力而越來越受歡迎，現在它們可以放在一個包中。

　　Products and applications

　　This article will look at two LEDs that can be used for outdoor lighting applications： the HLMP-CB1A-XY0DD from Avago Technologies and the C503B-GAN-CB0F0791 from Cree. These two products can both be used for outdoor signage but care must be taken in preparing and mounting them， and these precautions are looked at in detail. To put this into practice， the discussion will now look at how the Cree XBDROY-00-0000-000000L01 XLamp product can be used in optical design packages. There will also be a discussion on the benefits and disadvantages of standard versus high-power products using the Lumex SML-LX1206UWW-TR as an example.

　　Blue and green LEDs for outdoor lighting

　　Avago Technologies’ 5 mm blue and green LEDs in the HLMP-Cx1A range （such as the HLMP-CB1A-XY0DD） are untinted and non-diffused. The efficient InGaN material lets them produce well-defined spatial radiation patterns at specific viewing-cone angles. Their advanced optical-grade epoxy construction provides high-temperature and moisture-resistant performance in outdoor signal and sign applications， which can be used for commercial advertising， traffic signs， and variable message signs. The epoxy contains an ultra-violet inhibitor to reduce the effects of long-term exposure to direct sunlight. They are available in 470 nm blue and 525 nm green.