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Photopic System Require Bright Light?  Opportunity Summation Stimulus

The photopic system requires bright light because there is no summation, so the stimulus must be strong.

Le système photopique nécessite une lumière vive car il n'y a pas de sommation, donc le stimulus doit être fort.

Front Why does the photopic system require bright light? 
Back No opportunity for summation so the stimulus must be strong

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