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Generally
in the control led current methods will be used to fix the supply
voltage means and to adjust the resistance led by the current
intensity, which is the lowest cost solution, this drawback is, the
resistance will not only increase power, unable to meet energy-saving
effect, will increase the heat, lower life expectancy led the same
time, when the power supply voltage of the source of a difference they
are unable to promptly adjust the amount of current through the led,
which may have led the phenomenon of light-emitting unstable. |