How to detect LED stroboscopic and stroboscopic effects
The LED stroboscopic effect refers to two concepts. One is stroboscopic: the depth at which the luminous flux of the electric source fluctuates. The greater the depth of the undulation, the greater the stroboscopic depth. The second is the stroboscopic effect: the negative effect of the strobe of the electric light source on human vision. The greater the stroboscopic depth, the greater the negative effect and the more serious the hazard. The stroboscopic and stroboscopic effects are directly related to the type of electric light source and its technical performance. Different types of electric light sources with different technical performances have different stroboscopic and stroboscopic effects.
Strobe is actually a stimulating perception of the eye by the illumination source. The perception of the stroboscopic light source by the human eye depends mainly on the amplitude and frequency of the brightness of the light source. The source luminance amplitude is in turn usually expressed in terms of the modulation percentage of the amplitude and its luminance value. Experiments have shown that the different frequencies of the illumination source make the threshold percentage of the stroboscopic amplitude modulation visible to the human eye. When the frequency is lower than 15 Hz, the amplitude modulation degree is required to be high, and even if the amplitude modulation degree is small, the stroboscopic frequency is perceived. However, when the oscillation frequency of the light source reaches 50 Hz or more, the stroboscopic light is not easily perceived by the human eye. It is known through experiments that the higher the brightness of the light source, the higher the critical flicker frequency. In addition, if the source oscillates at a higher frequency, it is not easy to detect stroboscopic. However, when using an illumination source to observe a rotating object, the human eye can perceive that the strobe of the source is not limited to 50 Hz.
First, the test evaluation tool to visually detect and evaluate the stroboscopic and stroboscopic effects of the tool, usually using stroboscopic detection special gyro.
Second, the testing standard is based on sunlight. The luminous flux of sunlight is smooth and stable, and there is no stroboscopic and stroboscopic effect. The luminous flux of the energy-saving lamp is smooth and stable, and the closer to the sunlight, the smaller the stroboscopic depth of the energy-saving lamp, and the smaller the stroboscopic effect is.
Third, the method of detection and evaluation 1. First select a plane under the sun, the special detection gyro on the plane to rotate. The special detection pattern on the gyro is a multi-channel black and white halo. In the whole process of rotation, the pattern on the gyro does not change with the speed of rotation, but is stably fixed. This black and white, and stable fixed aura pattern, color phenomenon, indicates that the sun has no stroboscopic and stroboscopic effects.
2. Select a plane in the room, vertically hang a high-pressure mercury lamp on the top, and a number of energy-saving lamps of different manufacturers, and number the energy-saving lamps. Independent high-voltage mercury lamps and a number of different manufacturers of energy-saving lamps, independent switching control.
3. Light up the high-pressure mercury lamp, and rotate the special detection gyro under the high-pressure mercury lamp. The dedicated detection gyro produces multiple halos of different colors, and each aura will exhibit a random change in the direction of rotation, rotation speed, and color as the rotation speed of the gyro changes. This rich pattern of patterns and colors indicates that the stroboscopic and stroboscopic effects of high-pressure mercury lamps are very harmful.
4. Light up the energy-saving lamps separately, and rotate the dedicated detection gyro separately. Dedicated detection of the pattern and color of the gyro will result in the following changes.
a. The dedicated detection gyro only produces multiple black and white halos, and the black and white halo changes with the rotation speed of the gyro. Its rotation direction, rotation speed, and color do not change, and it is stable and fixed, which is similar to the effect under the sun. It shows that this energy-saving lamp has no stroboscopic and stroboscopic effects.
b. Dedicated detection gyro produces multiple auras with different colors, and each aura will show a random change in the direction of rotation, rotation speed, and color as the rotation speed of the gyro changes, but the color is lighter. It shows that this energy-saving lamp still produces stroboscopic and stroboscopic effects.
c. In energy-saving lamps that still produce stroboscopic and stroboscopic effects. Energy-saving lamps with relatively strong color and color, stroboscopic and stroboscopic effects are relatively serious. Energy-saving lamps with relatively light color, stroboscopic and stroboscopic effects are relatively light.
The strobo detection special gyro is used to evaluate the stroboscopic and stroboscopic effects of the energy-saving lamp, which is intuitive and easy to operate. In the actual lighting power-saving engineering design, a green light source without the stroboscopic effect hazard should be selected to construct a bright, clear and comfortable lighting environment.
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