Shell color really has nothing to do with the final output color. This is why Many LEDs are clear until powered, then they glow red, green, amber, etc..
The actual color of the light emitted is caused by the use of different materials or dyes between the LED's cathode (-) and anode (+).
A quote from the LEDmuseum.org:
Quote:
The color of light depends on a number of factors, including the type of material they make the LED with and the material's quantum bandgap (how much energy each electron needs to pack in order to cross the barrier).
A smaller bandgap that fairly weak electrons can cross gives you infrared or red light, while a large bandgap that needs really strong electrons gives you light that has a blue or violet color to it.
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-Nick
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