Vray lighting looks blow up

Hello,does anyone know why does my downlight looks like its been blow up?
It looks as if it burst out of the downlight
HP 2_2 - Copy

what is the type of Light used? IES or Spot Light. I think you had used the rectangle with disc option.

you may want to try embedding a sphere or spot light inside of the glass light (make sure the glass is transparent) or try making the glass itself an emissive material.