We live in a colorful world, our visual system has a clear judgement on different colors, so the color consistency of the lamps is very important in the commercial lighting application.
We often encounter color problems in our life, such as above.
Measuring color with the MacAdam Ellipse
Most of human sensory information is visual, coming to us through reflected light. Color consistency describes the non-variation in color from light source to light source, and fixture to fixture. We often don’t realize that we are influenced by the uniformity of color, but we always respond to it.
Let’s say you drive by two gas stations. Station A is illuminated throughout by bright white LEDs, while Station B’s lights vary from yellow to white and one panel is dim. You will likely go to Station A because its color consistency feels comforting and high quality, even if you aren’t conscious of that decision.
The difference in color between two lights is defined by an industry-specific standard called the MacAdam Ellipse. Each time the human eye can detects a color shift, it is measured as a MacAdam Ellipse step. In a range of 7 steps, the smaller the step, the more consistent lights are in color.
Matching colors base on the visual perception of eyes
Through the HONOURTEK technical personnel, according to a study in step 3 MAC Adam elliptical range, there will be four to five color background, and in step 2 MAC Adam elliptical range will be 3-4 color background, so in chromatography, the confluence of each color, is the human eye can see the color difference. And HONOURTKE’s technical staff based on the research of the human eye can identify color ability and judgment, to control the color of the LED point range, let the color point to minimize the human eye recognition scope. HONOURTEK through the technology make the LED shipment control can be in the range of human recognition of two colors. The level of color consistency control leads the world.
Impacting color with lighting optics
Beyond the light source, the optical components of a fixture can impact the tint. How the luminaire is designed optically—the amount of light it transmits, absorbs or reflects—will change the nature of its color point.
Station A gets its appealing consistency using identical white LEDs that are 2-step MacAdam Ellipse. But suppose those LEDs are placed in different fixtures. One fixture has a reflector with high reflectivity so only miniscule amounts of light get absorbed and the color point doesn’t change. The other fixture uses a diffuser made of green glass, which might absorb different spectrums of light and affect the color point of the fixture.
Once fixtures are designed with different optics, their LEDs get a warmer or cooler tint and the seamlessness of the system is gone. Lighting developers, manufacturers and specifiers must work together to preserve the consistency of color and holistically improve the consumer experience—and keep drawing us into the lights.