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Why do my values vary under fluorescent lights when using the PAR Light Sensor (Item #3668I)?
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Last Updated
10th of January, 2012

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When using the PAR Light Sensor (Item  #3668I) and measuring under fluorescent lights values may vary because fluorescent lights flicker on and off 100 or 120 times per second.  The sensor value depends on the precise instant when the reading is taken.  Because the values are averaged, the variation is usually apparent only when 1 minute (and to a lesser extent, 5 minute) intervals are selected.  When recording longer intervals or when using the FieldScout External Light Sensor Meter (Item #3415FX) the effect is generally not noticeable.
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