BME280 sensibility to UV light

[zoomx]

I found that if i use a UV LED flashlight against a BME280 temperature increase dramatically and humidity decrease the same way, instead pressure seems not affected.

BME 280 temperature & humidityBME280 temperature, pressure & humidity

The spectrum of LED UV flashlight is this one, taken with an Ocean Optics USB2000+ UV spectrophotometer

LED UV flashlight spectrum

Is the sensor so sensible to UV light?

[Vincent]

Is the UV light go directly into the hole of BME280? 

If you cover the hole with black cover,  is there still change of temperature and humidity?

[zoomx]

Yes the UV light goes directly inside but I discovered that the UV flashlight  warm all surfaces, also my skin. I don't know if it is an effect of UV or the flashlight has also an IR emission. White LED flash doesn't have this effect but I don't feel warm if I use it on my skin.

Anyway the graph shows that it is not a photoelectric effect since  the warming and the cooling are not immediate.

[Vincent · Accepted solution]

We should avoid any direct light into sensor hole. 

It will cause internal MEMS behavior goes to wrong like increased temperature slowly. 

So please cover sensor and test again.