Wrong readings. What am I doing wrong?

[jalla2000]

Issue

I think I have configured the device well, but I am getting wrong readings...

The black analog ROI should be 7.5, not 5,8. Is there anything I can do to improve the readings?

[SybexX]

I think it's your LED ring, you can see it fully in the picture(the reflection of it).

[jalla2000]

Dang. It's so hard to not get reflections....

[SybexX]

Maybe a thin white paper in front of the LED ring or a piece of Frosted Film could help.
or take a look here: #1949