CRI, the Color Rendering Index, helps compare how a light source renders object colors against a reference at a similar color temperature. The commonly quoted value, Ra, averages eight test colors. A score of 100 means agreement for those samples, not a guarantee that every product looks exactly as it does in sunlight. Negative scores are possible; see NIST's explanation of CRI.
When to compare CRI 80 and CRI 90
A CRI 80 fixture may be adequate for signs or displays where subtle color differences are not central. When visitors need to compare fabric shades, cosmetics, food or brand colors, include CRI 90+ options in a sample test. These are selection starting points, not a universal exhibition requirement. A higher number alone does not guarantee accurate saturated reds, matching photographs or a preferred appearance.
Ask for more than one number
Request the CRI value and measurement information for the exact model and intended CCT setting. If red shades matter, ask for R9; it is not included in Ra. Where available, a TM-30 report provides a broader view of color fidelity and saturation changes. The DOE LED Basics guide explains these limitations. An absent CRI specification means the value is unknown, not automatically below 80. Verify each BOOTH LIGHTS model rather than assuming one rating applies to the whole collection.
Compare samples in the actual display
- Use the real products, packaging and printed graphics, including shades visitors must distinguish.
- Compare fixtures at the same CCT and similar light levels on the display. Wattage measures electrical power; lumens, optics, distance and placement affect the delivered light.
- View samples from the aisle and handling position. Check shadows and reflections separately from color.
- Repeat with the expected hall lighting, then record the chosen model, CCT and position for the next show.
Check cameras separately
CRI does not measure flicker or guarantee camera color accuracy. Test the planned camera, white balance, frame rate and shutter setting with the fixture at the intended operating settings. Ask for flicker data if filming is part of the booth. A higher CRI does not establish flicker-free operation.
Compare CRI alongside output, beam distribution, mounting and cost in the LED display arm light range. Choose the fixture that passes your product test and fits the booth installation.