Just noticed blue light

Just noticed on my indoor fan there is a blue light showing during flower it’s on the power button I opened the tent and noticed it,can this ruin my plants
Or will it make no difference it’s about 1 inch by half inch?thanks
 
I’m 2.5 weeks into flower they budding ok
Can’t rennet how they liked 2.5 weeks into flower,they have done the stench
Iv nipped up and covered it,hope get away with it,I take picture tommorow morning,thanks
 
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