No a probe in the center of the light is measuring the surface temperature of it's own surface. Therefore it is a reliable way of measuring the surface temp. of the basking spot. All my cages have probes in the center of the basking spots to give me constant readings of the basking spot temp. their readings are the same as it I temp. gun it.

To measure ambient temp. the probe should be placed out of the light the same way you place an outdoor thermometer in the shade outside.

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