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Effect of Light Intensity on the Reflectance Readings of a Commercial Time-Temperature Indicator System

Department of Food Science, Cornell University, Ithaca, NY 14853

The effect of light intensity on reflectance readings of a LifeLines^TM computerized time-temperature indicator system was studied. Indicator labels were scanned at six different light intensities. Almost duplicate mean reflectance readings were obtained with labels scanned under light intensity of 800 lx and below. Readings of labels scanned at 1000 and 2000 lx were significantly higher than those observed with labels viewed below 1000 lx. When labels were scanned under light intensity higher than 3000 lx, no reflectance readings could be determined. The experiments showed that the Life-Lines^TM system, which consists of an optical bar code scanner, time-temperature indicator label, computer software for data analysis and telecommunication, and an IBM personal computer to process indicator data might not detect reliable reflectance readings when used in light greater than 1000 lx.