Example:
{ "ctm": { "ctm_version": 1, "extra":{ "light":15 }, "type": "eldritch" } }
Applying this to an mcmeta file renders with the texture warping of eldritch, but does not appear any brighter in dark places. Fullbright on non-eldritch render works as expected.

Thanks, good catch, there were a couple methods that didn't copy the lighting data.