[TxMt] Light Text/Black Background?!?

Don't know why I hadn't considered this before... my partner looked at my screen today while I was coding some JS and said "Are you crazy? You're going to ruin your eyes with that!" I did some cursory research (read: Google) and found conflicting opinions on the subject... but most seem to agree that black ground/light text is VERY bad for eyestrain. Taking this under consideration, I'd like to change the defaults for the JS bundle, but the prefs only allow for changing the defaults. How can I do this, and does anyone have any *real* data about the above considerations?