@RAMWolff - Here are the LightPath ambient boost nodes highlighted - one of the MT5 files in my freebies allows you to add -not "replace"- only these nodes to an existing color texture.

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Plug your color texture into both of the sockets highlighted with the green ovals.

@HartyBart : Just my opinion, but I don't think that they work well; the visible prop is very bright, but the lightcasting is weak. The lightcasting falls far short of the apparent brightness of the visible prop.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5