The best way is to add balancing resistors to the two LED's. Since you almost always need a resistor with an LED unless you have a current limited voltage source, you just use a resistor for each LED. Let's say you have 5VDC for a power source and you'd like to light the LED's to full brightness. You'd use a 100 ohm resistor for the green one and a 150 ohm resistor for the red one.
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