LED lamp stroboscopic serious, can you tell me the reason?
Apparently driven problem, your LED desk lamp is the 220 ac mains voltage rectifier, stroboscopic than incandescent bulbs.
Is zero, because ac 100 times per second of voltage is zero, if simply step-down rectifier circuit, or filter capacitance is too small, through the LED current is 100 times per second interrupt, LED is a semiconductor light emitting, reach nanosecond, response time and tungsten by electric heating filament reach the state of incandescent light emitting, filament cooling speed is about tens of milliseconds, you can turn on the LED desk lamp to see the inside of the circuit.
Use digital camera LED lights have similar moire interference, should be a digital camera sensor scanning frequency and multiple leds blinking frequency with a certain relationship, lead to no photosensitive sensor some particular locations and appear black stripes. According to the phenomenon that the LED lamp is resistance capacity drive is premature. In general, if the LED lights use resistance capacity device driver, then stroboscopic frequency twice of the ac power frequency, i.e., using flash frequency 50 hz alternating current while the frequency is 100 hz, with 60 hz ac for 120 hz - under the frequency, the human eye or is there a way to identify: the five fingers outstretched rapidly oscillating in the lamplight, if can see "a lot of fingers in the middle of the swing range (shadow), you can judge the LED use the low frequency pulse power supply driver. If the LED is used inverter type constant current power source, then stroboscopic frequency up to 40 ~ 200 KHZ, wiggle the fingers in this light, the human eye of persistence of vision has been unable to form such as "image of guanyin", so it can be the difference between the judgment
