LED Light Intensity using PWM
When higher light outputs are needed, a pulse width modulated current with a short duty cycle ("ON-OFF" Ratio) allows the diode current and thus the output light intensity t o be increased considerably during actual pulses, while still keeping the LEDs "average current level" and power dissipation within the safe limits. This "ON-OFF" flashing condition dosen't affect what is seen as the human eyes fills in the gaps in between the "ON" and "OFF" light pulses, providing the pulse frequency is sufficiently high, making it appear as a continuous light output. So pulses at the frequency of 100Hz or more actually appear brighter to eye than a continuous light of same average intensity.
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