is it a literal thing? its not like "love" or something lame like that? air and a fan? umm....maize? lol no idea, give us a clue?! why 2??
heres a hint: one of the things he buys is used for starting the other thing which will fill the room with something that isnt a material object
no, but whats was used kind of as a lamp in along time ago (no electricity involved) kind of a combination of all 3 of the recent guesses,
both of the things produce light in the same way one burns out faster because it is just meant to light an object the other takes longer, one of the items was used in one of cavallins riddles.