To understanding lighting light of flashing (evasive) on have understand its work principle, usually used electronic ballast of fluorescent or electronic control device of LED lamp are is in high frequency current Xia work, to reached people Visual cannot perception of frequency Flash, its frequency usually in 20 kHz on, relative Yu work frequency in 50 Hz following work,, people eye more difficult perceived its high frequency of flashing, but frequency Flash still exists, just high frequency work Shi of frequency to than using workers frequency work Shi of frequency high many. Objects under the flashing lights will be discrete rather than continuous, this effect is called stroboscopic effect, its level depends on the speed and scope of Flash, also associated with the movement rate and observe the status. As the average consumer can use the phone's camera, the camera light up close, according to the stripes of a mobile phone screen scrolling or flashing judging shading conditions.
(1) the illuminating engineering society of North America (Illuminating Engineering Society of North America,IESNA) a thorough interpretation of the technical documentation for Flash, usually working in AC voltage light source produces flashes, which are observed, depending on the light source produces light at alternating current frequencies and observe the condition, flashes on the moving object within the observation effect is significant. Scintillation index is considered to be at a given power source output loop frequency change relative values of reliability, scintillation index taking into account light output waveform and magnitude, this value by one average light output for a single curved line above the area divided by photo-output curve of all area calculations. Figure 2 shows a higher value, that can be detected by stroboscopic effects and possibility of blinking lights on the rise.