Shininess value and intensity of light in specularMap

Hi (I use google translator.)
I’m making 3d shoes with three.js
The set value is spotLight( 0xffffff, 0.1 ), ambientLight( 0xffffff, 1.4 ) and loaded obj file, mtl, specularMap jpg (MeshPhongMaterial)

I set a shininess value of 230 to express shininess.
And I set it the same as the specular sync color.

By the way, the specular area is shininess but the light is too strong.
For example,

I want to

Could you tell me what i need to set up?
I will be very grateful.
Thanks you!