(Question) Is there any way to make pieces with the TU/Metallic shader brighter in darkness?

[rettoph]

I have the following KSP_TEXTURE_SET

KSP_TEXTURE_SET:NEEDS[TexturesUnlimited]
{
    name = My_Metallic
    title = Metallic

    MATERIAL
    {
        mode = create

        shader = TU/Metallic

        PROPERTY
        {
            name = _Color
            color = 1.1,1.1,1.1
        }
        PROPERTY
        {
            name = _Metal
            float = 0.7
        }
        PROPERTY
        {
            name = _Smoothness
            float = 0.7
        }
    }
}

The texture looks fine when under light, but is hardly even visible in the darkness. Ambient lighting seems to do very little. Its particularly jarring when mixing metallic and non metallic pieces.

Is there any chance i'm doing something wrong? Is there some way to keep the look of a metallic piece somewhat consistent with stock pieces in the dark?