This is what I have learned about LEDs. They are powered by a power supply that monitors amperage rather than volts. If you have a LED listed at 3 volts and use a resistor to reduce the 12 volts in our system to 3 volts it will light the LED. However during the engine run when the charging system has raised the voltage to close to 14 volts, it will over power the LED. Or conversely if the battery is not producing 12 volts the LED will be under-powered. Both these situations will result in a different light output. The "Powers that Be" have determined that LEDs are more efficient with constant current. The circuitry that monitors and adjusts current appear to be very noisy as it apparently produces frequencies in our RF band that we can hear during radio reception.

All the LEDs will produce light using a resistor with no noise, but the light output will not be a consistent brightness. I would expect that the light arrays produced specifically for aviation use have filtering systems built into the power supply that eliminates the high frequency noise we hear in our headsets. That is likely why they are priced as they are.