LED照明基本規(guī)格參數(shù)_圖文

1、 Chromaticity Coordinate Shift The LED's color characteristics are dependent from the forward current. Special attention must be paid when using LED drivers with Red-Green-Blue LEDs. Light dimming should not modify the color rendering. Preferred solution is PWM dimming to ensure that LEDs are dr

2、iven with known forward current. Osram: LWY87C 11 TND328/D Rev.1 Sep07 Temperature Influence Forward voltage: All LEDs exhibit forward voltage variation as junction temperature changes. The temperature coefficient depends from junction type. InGaAlP LEDs (Yellow and Amber Red have a coefficient of b

3、etween -3.0 mV/K to -5.2 mV/K, and the InGaN LEDs (Blue, Verde Green, and White have a coefficient of between 3.6 mV/K and -5.2 mV/K. (Golden Dragon LWW5SG Intensity change over temperature: Light intensity decreases as the temperature increases. This is a result of changing efficiencies in the semi

4、conductor, and not a result of the change in the forward voltage over temperature changes. This temperature change is non-linear. 12 TND328/D Rev.1 Sep07 Temperature Influence Permissible current: LED manufacturers have realized significant improvements to allow high current operation. Nevertheless, high current LEDs used for camera phones exhibit shorter lifetime than small LEDs dedicated to backlight. This is not a strong issue in case of flash-light because of short pulse duration, but it must be tak