cycles glossy problem

im, trying to create a glossy mat in a vertical position
but it comes out very dark almost black
don’t really have any light in front only on top and sides

is that normal?

is mean if i set it horizontal then it seems to come out well
but not when in vertical position

seems to have something to do with Spec of the glossy


i would like
to render some hlossy white mat and glossy black material that are in a vertical position
whiout loosing one of them and still have a good contrast and glossyness

thanks