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IV curves
Voltage Regulation: Zener Diodes vs. LEDs «
Different forward voltages of red-green-blue (RGB)LEDs under the same
LED forward current vs forward voltage - Electrical Engineering Stack Exchange
Basic Light Emitting Diode guide - DP
Variations in Vf and binning
Circuit 8 of 48: The LED Circuit - Stompbox Electronics
Constant Voltage Vs. Constant Current LED Drivers, The Design Engineers' Guide
How to calculate the series resistor for an LED – Stompville