Why Lighting Conditions Matter When Reading Test Strips
When using pH, ketone, or other reagent-based test strips, most people focus on timing and technique. They carefully dip the strip, wait the recommended number of seconds, and compare the pad color to the chart. But there’s one critical factor that often gets overlooked:
Lighting conditions.
The accuracy of color-based test strips depends not only on chemistry — but also on how your eyes perceive color. Poor lighting can distort shades, alter contrast, and lead to misinterpretation of results. If you track trends in urine pH, ketones, or hydration patterns, consistent lighting may be just as important as consistent timing.
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