What should be paid attention to when designing a power supply for LEDs?

(3) The current-voltage characteristics of the LED are non-linear. The current flowing through the LED is numerically equal to the electromotive force of the power supply minus the potential of the LED. The electromotive force is divided by the total resistance of the loop (internal resistance, lead resistance, LED body resistance).Sum).Therefore, the current flowing through the LED is not proportional to the voltage applied across the LED.(5) The ratio of the current flowing through the LED to the luminous flux of the LED is also non-linear.The luminous flux of the LED increases as the current flowing through the LED increases, but it is not proportional, and the later the luminous flux increases.Therefore, the LED should be operated at a current value with a relatively high luminous efficiency.