How to effectively test enable LED lights, rise and stroboscopic effect

More LED information, please click Real Green Lighting Company Limited

Because of good luminous efficiency of LED solid-state lighting products, long life, high reliability unique characteristics, and thus more and more by the market and consumers. But due to the LED response speed, and it does not have the effect of thermal inertia and persistence of the traditional lamp, so by current fluctuations, current fluctuations directly affect the luminous flux output, flashing light flux change is the external expression, so flickering LED lighting products also attracted everyone's attention. In this Dec. 14, 2012, the EU in its official gazette officially released the first (EU) NO Regulation No. 1194/2012 "of the European Parliament and the EU Council 2009/125 / EC Directive on directional lights, LED lights its eco-design requirements of the related equipment implementation details. " Corresponding to the European Commission on March 18, 2009 release (EC) NO Ordinance No. 244/2009 "Rules for the Implementation of the European Parliament and the EU Council 2005/32 / EC Directive on the non-directional household lamps eco-design requirements of" So far the EU LED lights to form a complete mandatory eco-design requirements. Start time and rise time as the two indicators functional requirements in the industry more and more manufacturers attention.


We have just the flicker effect when it comes to LED lighting products, but many people do not know it in the end what it meant. Flashing light flux fluctuations in essence, the essence of the light source in AC or DC pulse driven, luminous flux, illuminance or brightness corresponding changes with the magnitude of the current cyclical changes, the human eye to the brain to produce this change subjective reaction. Usually divided into people's feelings by flashing visible flicker (Visible Flicker) and invisible flicker (Invisible Flicker). When the frequency is greater than 100Hz, the human eye do not feel flicker, but still cause eyestrain, headaches, etc., which is Yan flash effect, generally considered within the 500Hz effect there. In this regard the US Energy Star (ENERGY STAR lamps V1.0 draft 4 provisions dimming performance requirements to be fulfilled in the flashing conditions, for use in all fixtures as shown below:


LED lighting


Flashing light allowed range is:

1, the frequency is not less than 120Hz;

Within 2,120Hz-800Hz frequency range, F1 <0.001 X frequency


3, when the frequency is greater than 800Hz, no requirement for F1;

4, frequency uncertainty, PF <30%;

In addition, compact fluorescent light output frequency must 20-30KHz, or greater than 40KHz.

Unstable nature of light flashing luminous flux. Upon detecting light fluctuates with time, either test the brightness curves can also test luminous flux or illuminance curves under the same conditions. ENERGY STAR (V1.0) provides flicker flicker measurement requirements:

1, power supply and measuring instruments, must meet the requirements of LM-79-08;

2, multi-channel oscilloscope with a memory function, necessary, to add attenuator probe. The sampling rate is greater than 2kHz, the sampling time is greater than 100ms;

3, the photometer head, V (into) the correction, and the response time required to meet the requirements;

4, in the absolute photometric (absolute photometry): absolute value measurement requires integrating sphere; relative value metering (relative photometry): ensure that the detector is capable of measuring the relative light output, and only receives light from the light source to be measured.


Before measuring, the compact fluorescent lamps need Aging 100 hours required preheating before measurement. LED lights do not need the old mill, the ambient temperature at 25 +/- 5 degrees.