What causes the difference in color between LEDs?

Related questions

1. Do resistors limit current?
2. What is an LEDs?
3. Do resistors save energy?
4. Is the anode oxidized or reduced?
5. Why do you need a resistor with an LED?
6. What is common anode led?
7. What is the operating principle of LED?
8. Is the red wire the anode or cathode?
9. Would you have led or lead?
10. What happens if you connect an LED backwards?

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20. #wavelengths
21. #amber
22. #different