Unwanted blured Photometric Lights In Reflections

[peterpiper]

Hi everybody!

 

So this is may setup:

-render is mental ray

-a studio setup which contains 3 photometric lights and simple mesh with a

a glossy arch& design material on it:

 

reflection gloss: 1.0

ior: 2

 

in the scene there is also an hdr witch has a dimension of 2000x1000. it is plugged into

a environment blur map.

for the overall exposure control i using the logarithmic control.

 

as you can see that the photometric light above is completely blurred.

i used work with vray but now i want to take a closer look on mental ray.

 

is there a way to get sharper light reflection?