So far Nick, your explaination make the most sense to-- but durative? I would have thought it was a gerund--
I lit the lamp at the door, and it the lighted the way up the stairs to the door.
(but i might have used illuminated-- but as i say it, its sounds, oh i don't know, overdone? to fancy a word?)

So now enlighten me, how is durative different from a gerund? (do gerunds have to end in ing-- and lighting-- the lighting in the room was harsh-- well that not a gerund...its a noun... so what is the gerund form of light? (I am at a loss-- can lighting be used as verb? I can't think of a sentance right now...)