Fluorescent Replacement Lighting for Photo Gallery

About the Northlux 5000ºK LED tubes, what accounts for the difference I measured in CCT, and what is on the spec sheet?

Our official specification for the 5000 K LED tube lights is 5000 K plus or minus 180 K. The variation between what you measured and what is shown on our photometric report is likely caused by inherent color variation between lamps and lamp batches, as well as variations in measurement equipment, calibration, and precision.

We would expect that your spectrophotometer would also show variations between measurements, likely on the order of 25-50 K between measurements of the same lamp. Likewise, our photometric report showing 5064 K represents a single measurement only; repeated measurements of the same lamp would also likely show variation.

Also, R12 seems a little low. The spec sheet and what I measured both say 75. I noticed that the specs for R12 for the 5000ºK LED strip and what I measured are 91. Is this caused by batch-to-batch variation, or does the color of the glass in the tube have any effect? Do you use the same LEDs in all your lights?

Similar to color temperature, R12 can also vary significantly between lamps as well as measurement devices. The spectral reflection and absorption properties of the LED tube glass also play a role and are taken into consideration by utilizing different phosphor recipes for the underlying LEDs depending on the final product type (e.g. LED strip vs LED tube vs LED linear lamps).

Our end goal, however, remains the same with 95+ CRI and as tight of a color tolerance as possible.

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T8 LED tube lightsFluorescent replacements

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