LEDs Test Method: Luminous Flux and Luminous Efficiency
Method 2003: Luminous Flux and Luminous Efficiency 1 Objective Measure the luminous flux and luminous efficiency of LED device being tested under the rated condition. 2 Test Chart Picture 9 Method 2003 test chart Note 1: the optical radiation lunched by the LED device under test has been reflected many times through the integral wall [...]
The Effective Ways of Improving the Luminous Efficiency of LED
LED luminous efficiency is an important factor to measure photoelectric devices. How to improve the efficiency of LED enables it to achieve the effect of energy saving, this paper has introduced the effective ways of improving LED efficiency from the four aspects including the transparent substrate technology, metal reflecting technology, surface micro structure technology, and flip chip [...]
LED Measuring Principle Part1: Luminous Efficiency and Flux
1 Introduction For nearly 30 years, LED technology has experienced a rapid development process. Because of its inherent advantages such as high efficiency, long life and low loss, vibration resistance and fast response speed, LED has been widely applied such as indicator light, display screen, traffic lights and so on, and it is currently being [...]
Photometric Terms
Luminous flux: Φ, Lm Luminous flux is the sum total of the amount of light per second generated by the illuminant. Light intensity: I, cd The luminous intensity is the luminous flux from a point source emitted per unit solid angle in a given direction. A goniophotometer can be used for measuring light intensity. Illuminance: [...]
To Improve the Luminous Efficiency
To improve the luminous efficiency and the power of LED used for lighting is one of the key problems of the industrial development at present. At the same time, the and shell heat dissipation problems are particularly important. Generally we use the led thermal resistance , shell temperature and junction temperature to represent. At present, [...]
