Photometry involves measuring the perceived brightness of light. Since not all humans perceive light the same way and not all wavelengths generate the same amount of eye sensitivity, photometry is a scientific attempt to provide a standardized model for measuring brightness.

Here at Titan LED, we believe in producing the highest-quality product and helping our customers learn how best to apply superior lighting for better business outcomes. That’s why we offer photometry engineering to plan lighting schematics. Here are some ways that LED lighting can enhance a store’s retail lighting, using optimized photometry.

Important Photometry Terms

  • candela – a unit of luminous intensity
  • lumen – a unit of light quantity flowing from a source in one second
  • luminous flux – visible radiated light energy per second
  • luminous intensity – quantity of visible light emitted per second per unit solid angle, measured in steradians
  • luminance – also called photometric brightness, measured in candelas per square meter

How Photometry Knowledge Improves Illumination

LED lights are designed to maximize plant growth in greenhouse environments, which is why they have been widely adopted by farmers. The intensity of blue and red light has played a huge role in enhancing crop growth. The horticultural industry has recently experimented with red, blue, and white lighting and continuous monitoring helps them further learn about how lighting affects growth patterns.

However, the benefits of LED lighting and thoughtful photometry schematics go far beyond the greenhouse. The use of photometry allows you to develop a deeper understanding as to how brightness affects consumer perceptions of retail displays. Eye response is maximized at a wavelength around 555 nanometers. Most human eye response activity occurs in the range of 400 to 700 nm. This photometric knowledge can also be applied to car dashboards, smartphones, TVs, and computer monitors.

Photometric Code

Manufacturers of LEDs utilize a process called binning to categorize LEDs by brightness and color. Every LED is designed with a 6-digit photometric code, which reveals key information about emitted color. The three main purposes of a photometric code are to indicate white color temperature, define the ability of the device to render different colors, and to guarantee accuracy of the manufacturer’s claims.

The left three digits of the code indicate the color of light. The first digit is a value from 0 to 9 for the Color Rendering Index (CRI). The next two digits represent the color temperature, which is calculated by using degrees Kelvin divided by 100. The three right digits of the code represent the initial color deviation, the level of deviation after 6,000 hours, and the lumen maintenance value at 6,000 hours.

Ultimately, photometry, a study of lighting that has been around since the early nineties, gives retail store owners and managers an idea of how well their displays are illuminated, and how they can leverage that data for better retail outcomes.


Understanding photometric measurements gives you quality control of retail lighting. Getting a photometric analysis of your retail store may help improve eye sensitivity to your displays. Contact us at Titan Led Lighting Solutions to learn more about how to maximize retail lighting.



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