noise and light speckless in my render

[bregman.l.c]

Hi you all,

in the attachment I enclosed my render and you can see in this picture that this render contains a lot of noise and light speckless... I have rendered the same scene in from another angle and no speckless are shown... I don't know how I can get my render bright like I did when I made my other render... 

I also discovered the noise filtering, but this doesn't solve my noise and makes my render very dark. 

My final gathering is as high as possible and I use 100000 photons with a samping radius of 1524mm

Oh and btw I render in mental ray...

Can you guys please help me? Im kind of desperate with this one... 

Thanks a lot!