Photosensor voltage changes with blue and green LEDs at same intensity

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Kipster1203
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So me and my partner got these photosensors as part of our project and were testing them today and got some weird results..

We started by shining a blue LED and the voltage output would drop over time.

we then hooked up the green LED and the voltage would rise over time...

From the spec sheet I know that the photosensor is most sensitive to green, but I can't figure out is why the sensor outputs a different voltage with the same light intensity input.

Any help is greatly appreciated, thanks
 

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Kipster1203 said:
From the spec sheet I know that the photosensor is most sensitive to green, but I can't figure out is why the sensor outputs a different voltage with the same light intensity input.
That makes no sense that's what sensitivity means. Less sensitive means lower output for the same intensity input.