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Channel Letter Lighting ChoicesThere are many different ways that you can light up your channel letter sign: neon, LEDs, fiber optics, etc. There are two important indexes for judging the importance of various lamps in illuminating your sign: Color Rendering Index (CRI) and the light’s color, expressed as degrees Kelvin (K). In degrees Kelvin a lower number is a more “yellow/red” light, a higher number is a more “blue” light. Interestingly, the color of “daylight” varies from the equator to the poles. But it is generally accepted as about 6000K with a CRI of 100. A CRI of 100 is perfectly matching the sun’s effect on colors. In white neon the old standard has been that 6500K neon is best for lighting a sign face. It has a CRI of 65. The tri-phosphor “rare earth” neon Electric Sign Association members use to illuminate digital graphics, translucent paint, translucent vinyl, and color transparencies has a CRI of almost 100. Unless you work for a very major corporation and have been paid to study this issue this information has not been readily available until now.
The left side of the picture is a sign lighted by Daylight HO fluorescent lamps, the right side with CW HO lamps. A thin black line has been placed where the two pictures are spliced together. Daylight HO lamps are 6000K with a CRI of 65. CW HO lamps are 4500K with a CRI of 50. Fluorescent lamps are actually just large pieces of neon! Our simple goal is to get a potential customer to notice your sign first; rather than look at someone else’s sign and never notice yours. |
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