Difference Xenon flash and LED fill light
2015/12/15 view:
Xenon
flash and LED fill light LED fill light difference is the use of LED
light-emitting diode on the subject fill light, LED light due to the low
energy consumption and high brightness is generally used in camera
phones or digital cameras, light is not used Fill stoppage time. Since the luminance LED light-emitting diode is much lower than the real flash, it can only act as a "fill light" role. Some
phones now have to spend the same, and a camera flash, such as the Sony
Ericsson K790c, Xenon flash is used, the effect is better than the LED
lights up, but not like as steady as LED flashlight use. Xenon flash principle: Xenon flash, also known as high-intensity gas discharge flash. Xenon
flash from the xenon bulb, ballast and insulation transformer wire
composition, the use of special xenon gas in ultra-high voltage state
firing discharge. The
working principle is that after contact triggered by the camera,
through the transformer, in an instant will rise to 20,000 volts 12V
power than high-voltage pulse voltage, start xenon bulb xenon gas
produced in the arc 6000K - 10000K color temperature strong light, the color was white in the slightly purplish blue crystal diamond. When
you press the shutter, the shutter back a signal to the CPU, while, CPU
synchronous trigger a control signal to the transistor output circuit,
the flash. Then
the transistor is turned on, the trigger capacitor begins to discharge,
producing a pulse current in the transformer primary, the transformer
secondary currents generate nearly 4000v high pressure, stimulate the
internal hernia flash ionization and conduction. Make instant energy storage capacitor discharges through the flash tube into light, to complete a flash. Early flash life is very short, and some magnesium flash tube only once. According to industry standards, then known as a million times, real life should be far short of million times. Now flash, through technological innovation, life should be increased. LED
flash principle: LED not through internal electronic atomic jump to
light, but by applying a voltage in a PN junction LED at both ends, so
that the PN junction itself forms a level, then the electron at this
level jump Variable and produce photons glowing. Qualified LED life at rated power should reach 100,000 hours. If the phone is in the design of the LED drive current will exceed the
rated current to use the words, LED life will be shortened to thousands
or even hundreds of hours.
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