"Due to the composition of our atmosphere, the sun emits only about a quarter of the radiation at 940nm than it does at 850nm. That means that a much-less-powerful LED can be used for outdoor applications, and still be effective. That is why the SparkP2 out-performs current-model back-side illuminated (BSI) sensors outdoors — even using a much-lower-power 10 mW LED instead of a 750 mW LED — at least according to Invisage’s tests:"
More About Invisage SparkP2 Sensor
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ExtremeTech seems to get some exclusive marketing materials on the Invisage SparkP2 sensor:
"Due to the composition of our atmosphere, the sun emits only about a quarter of the radiation at 940nm than it does at 850nm. That means that a much-less-powerful LED can be used for outdoor applications, and still be effective. That is why the SparkP2 out-performs current-model back-side illuminated (BSI) sensors outdoors — even using a much-lower-power 10 mW LED instead of a 750 mW LED — at least according to Invisage’s tests:"
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"Due to the composition of our atmosphere, the sun emits only about a quarter of the radiation at 940nm than it does at 850nm. That means that a much-less-powerful LED can be used for outdoor applications, and still be effective. That is why the SparkP2 out-performs current-model back-side illuminated (BSI) sensors outdoors — even using a much-lower-power 10 mW LED instead of a 750 mW LED — at least according to Invisage’s tests:"