The only thing you would be using LEDs for in the late 70s would be indicator lights and 7-segment displays. The only colors available are red, green and yellow

The only thing you would be using LEDs for in the late 70s would be indicator lights and 7-segment displays. The only colors available are red, green and yellow, and they wen't bright enough to illuminate dials, instrument panels or cockpits. Even if they did use LEDs where they made sense, they would still need hundreds of incandescent bulbs.