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(shù)之一，特別是藍(lán)色和綠色。雖然技術(shù)的歷史可以追溯到上世紀(jì)90年代，大功率InGaN技術(shù)更近。

　　這個(gè)領(lǐng)域的可用產(chǎn)品可以應(yīng)用到現(xiàn)代應(yīng)用中，標(biāo)準(zhǔn)和高功率產(chǎn)品都有其優(yōu)點(diǎn)和缺點(diǎn)。標(biāo)準(zhǔn)發(fā)光二極管的優(yōu)點(diǎn)是更容易設(shè)計(jì)，以及更小，更便宜的高亮度對(duì)應(yīng)。然而，一些應(yīng)用，如街道照明和汽車頭燈，需要額外的權(quán)力。在這兩種用法之間仍有許多應(yīng)用程序。

　　LED的色飽和、節(jié)能、長(zhǎng)壽命是照明應(yīng)用領(lǐng)域中發(fā)展最快的領(lǐng)域。白色和彩色發(fā)光二極管在建筑照明、娛樂(lè)、裝飾照明和視頻墻中有著廣泛的應(yīng)用。紅色、綠色和藍(lán)色發(fā)光二極管由于其結(jié)合其他顏色的能力而越來(lái)越受歡迎，現(xiàn)在它們可以放在一個(gè)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.