Testing LED lights blinking and stroboscopic effect

LED stroboscope refers to two concepts is

a stroboscopic the depth of the luminous flux of electric light source fluctuation, fluctuations in depth, the greater the stroboscopic depth is larger.

2 is stroboscopic effect that electric light source stroboscopic in person visual sense to produce negative effects. The stroboscopic depth, the greater the negative effect is larger, the more serious the harm.

stroboscopic and stroboscopic effect, with electric light source types and its technical performance has a direct relationship. Different types and different technical performance of electric light source, the stroboscopic and stroboscopic effect degree is different also.

stroboscopic lighting source is actually a perception of a stimulus to the eyes. Perception of the human eye to light stroboscopic mainly depends on the amplitude and frequency of the guang-yuan yu brightness. Lighting source amplitude and often with amplitude modulation percentage and its brightness values. Experiments show that lighting light source frequency make the human eye can perceive different threshold percentage of stroboscopic amplitude modulation is also different.

just we have said to the stroboscopic effect of LED lighting products, but many people don't know what it means.

stroboscopic light source is the essence of flux fluctuation, substance source under the exchange or pulse dc drive, luminous flux, the intensity of illumination brightness or cycles with the current amplitude of the corresponding change, the human eye to the brain response to the change of subjective.

flashing according to the feelings of people usually divided into visible flicker flicker and not visible. Frequency is greater than 100 hz, the human eye feel flicker phenomenon, but still can cause eye fatigue, headache, etc. , this is called the stroboscopic effect, this effect is generally believed that within 500 hz. The U. S. energy star ( ENERGYSTARlampsV1。 0 draft4 flicker in dimming performance requirements specified in the conditions to be fulfilled, used for all lamps and lanterns. As shown in the figure below

stroboscopic light source allows is

1, the range of frequency is not less than 120 hz;

　　2、120Hz- 800 hz frequency range, F1

3, when the frequency is greater than 800 hz, no request for F1;

4, frequency is uncertain, PF

in addition, the output frequency need a 20 - to compact fluorescent lights 30 KHZ, or greater than 40 KHZ.

light stroboscopic light flux is the nature of instability. In detecting light fluctuate over time, can not only test the brightness change curve, also can test the change of light flux or curve in the same conditions.

能源之星的级别( V1。 0) Specifies the flicker flicker measurement requirements

1, the power source and the measuring instrument, to meet the LM - 79 - 08 requirements;

2, with the function of storing multi-channel oscilloscope, and attenuation probe when necessary. Sampling rate is greater than 2 KHZ, sampling time is more than 100 ms;

3, photometric probe, V ( In) Correction, and the corresponding time to meet the requirements;

4, for absolute photometry ( absolutephotometry) Measure the absolute value need integrating sphere; For relative photometry ( relativephotometry) To ensure that the probe can measure the relative light output, and only accept from metering source of light.

before measuring, compact fluorescent lamps need burn-in 100 hours, need to preheat before measurement. LED lights without aging, environmental temperature of 25 + / - 5 degrees.

content extends

because LED solid-state lighting products with good luminous efficiency, long life, high reliability features, unique and therefore more and more popular with the market and consumers. But at the same time due to the LED fast response speed, but also do not have the thermal inertia of lamps and lanterns and traditional afterglow effect, so deeply affected by the fluctuation of the current fluctuations in current directly affect the output of luminous flux, light blinking is the external embodiment of luminous flux change, so the LED lighting products of flicker problem has aroused the attention of all.

on December 14, 2012, the European Union on its official communique released its first formal EU) NO1194 / regulation no 2012 'of the European parliament and the European Union council directive 2009/125 / EC about directional lights, LED lights and its related equipment detailed rules for the implementation of ecological design requirements. Corresponding to the commission released on March 18, 2009 the first ( EC) NO244 / regulation no 2009 'of the European parliament and the council's 2005th / 32 / EC instruction of non-directional household lights detailed rules for the implementation of ecological design requirements, thus the eu of leds to form the complete mandatory ecological design requirements.

start-up time and rise time as two indicators of functional requirements, more and more get the attention of the manufacturers in the industry.

coordinating editor; CQJ

Shanghai force shanyou electronic technology