But as Dade said also this is not a Luxcore problem. The engine output what you throw in. So Blender/blendluxcore is where the change need to be done. BTW here you can find that for 2.8 OCIO seem to be considered and use at some point :
There's some misconceptions here I'd like to clear up.
By default, Blender puts you in the Filmic "Blender" color space - one made specifically for Blender. It is "wide-gamut" and supports plenty of dynamic range in the scene-referred values. If your only concern is that you're somehow trapped in sRGB space for rendering, well...you're not, unless you've intentionally moved your scene-referred color space to sRGB, which is not default.
Be aware that the Blender compositor has many nodes which do not work in scene-referred color space - the only truly safe one I know of is the Color Balance (ASC-CDL) node. For this reason, I choose to use industry-standard VFX applications for my color grading.
With that out of the way, it is possible to use ACES inside of Blender if you follow the links in the post previous to mine. Be advised that if you do this, some random features will not work in Blender, such as the "False Color" LUT, since that is specific to Filmic. The upside of ACES is that it is fully-supported in most professional-grade applications and thus a good choice for integrating into a larger pipeline.
If your only concern is simple color grading and generally keeping things inside Blender, stick with Filmic and the ASC-CDL node inside of the compositor.
