Hi @nathanphilsteele,
I believe this has been answered previously at the following link: Is there a way to have a light box link pop up off a txt link?
The answer provided is as follows:
"Basically, the defaulted image that you get when you add the Lightbox, can be replaced with a Text Block too. So:
Drag in the Lightbox widget
Drag a Text Block into the Lightbox wrapper
Delete the defaulted image (unless you want to keep it)
Style the text block how you like!
In the Settings Panel for the Lightbox, you can add images and videos that will be seen when the user clicks on the text block."