More info needed
I think most of UX questions should be replied with "Depends.".
In this case, why would you rely on a lightbox for opening a page? Only so you can avoid creating another HTML file or page in the CMS? I can't see the benefits for the users; but I do see some potential issues.
Given the lack of further info, in a common scenario, I would recommend you to stick to conventionalities: use links + pages, not light boxes. More info in the next section.
Light boxes come in handy in situations where:
- Displays are big enough (definitively not mobile).
- Content revealed is short or adaptable to a minimum view size (see point 1). E.g.: videos, pictures and maybe short text.
Have in mind that light boxes force a two-click navigation:
- Action the link.
- Close the lightbox.
And, since a hyperlink is a well established convention, most users will expect navigating to the page, not opening a lightbox.
There are also technical concerns with the use of light boxes: why loading a JS framework + a lightbox script? You can improve responsiveness and loading speed avoiding them.