When i create a lut using peak luma my ftl for 100% white drops petty drastically, but when i pick peak chroma my 100% white ftl does not change. I thought the opposite would be the case? Can somebody explain peak luma vs peak chroma in some more detail?

It all depends on the profile data!

It is indeed possible for the effect you describe to happen - it just means the display gamut is a greater error than the colour temperature.
The display probably has a poor RGB Separation?

Steve

You know the display, its my piece of you know what mitsubishi dlp lol. Thanks for the reply, i was just under the assumption that peak luma would keep the Y value of 100% white the same no matter what.