Perhaps that is lightandnotlight. We almost have notlight in English: unlit. An unlit room feels twilighty to me.
> notright
Left in Esperanto: maldekstra
I can’t imagine why a language designer would choose “mal” as the prefix for “not”. In English and Spanish (two common languages), mal has some bad connotations (malodour, malady, malfeasance, malo, malformed). Let’s try the opposite: “not left” is definitely something different from “right” - urrrgggh. “Do not go left” doesn’t mean to go right.
However it looks like Esperanto also has “liva”. Turnu liven tuj post la angulo ~= Turn left immediately after the corner.