Today let us to share some of the basic concepts in LED testing:
When the forward voltage of the light-emitting diode is a positive value, the voltage drop between the two poles occurs.
"Reverse current" is applied to the light-emitting diode at both ends of the reverse voltage to a certain value, the current flowing through the light-emitting diode.
The "peak wavelength" spectrum of radiation has the highest wavelength.
In the luminous (or radiant) intensity distribution, the luminous (or radiated) luminous intensity is greater than or equal to the maximum intensity of half the angle.
Any of the colors of the "main wavelength" can be viewed as a mixture of a certain spectral color with a reference light source (such as CIE standard light sources A, B, C, etc., etc.), the standard light source E, the standard illuminator D65, etc.) Out of the color, the spectral color is the main wavelength of color. The main wavelength of the color corresponds to the color (color) of the color observed by the human eye. If you have obtained the chromaticity coordinates of the LED device under test, you can use the white light E light source (x0 = 0.3333, y0 = 0.3333) as the reference light source to calculate the main wavelength of the decision color. When calculating the slope of the straight line connecting the reference light source chromaticity point to the chromaticity point of the sample color, the intersection of the straight line and the spectral trajectory is read and the main wavelength is determined.
The ratio of the luminous flux dΦv contained in a small solid angle element in a given direction to the solid angle dΩ in candlelight (candela, cd).
"Radiation Bandwidth" The spectral radiated power is greater than or equal to the maximum half of the wavelength interval.
LED test can refer to the "CIE-127-1997 Measurement of LED" recommended standards, select the conditions A and B to measure the near-field conditions, the average LED specification information.