This patch panel does not accept LGX panels. Well it will accept one but it will not fit on the end and if put in one of the two middle slots, that prevents the slot on either side from being used.
Now that I have the LGX panels in my possession, I see that the maximum width of any patch panel is 3 LGX panels wide. There is physically not enough room to have 4 LGX panel in a standard 19 inch rack. When this patch panel refers to itself as a "High Density" patch panel, I believe it is referring to the panels themselves and LGX are not high densitiy.