LED Channel Letters are definitely leaving their glowing mark along the way with there energy efficiency as compared to neon.
This is not to say that one technology is better than the other, but that sign fabricators and end-users now have more choices in the best ways to design their sign lighting.
Although LEDs are available in the full range of primary colors, some LED colors perform better than others for channel letters. Red, which is the oldest existing LED, one of the brightest and also the least expensive, is obviously the most popular color employed in channel letters for lighting. Other LED colors aren't always as bright as red, or as affordable. Thus other LED color selections are judged on a case by case basis of the sign size and how well the LEDs can illuminate it.
Take a look and compare for yourself, just click on a link below.