Another mistranslation

[Lostgaeriel]

Of course, now that I've had a chance to think about this one for a few minutes, I think I know what it is. If my friend HerenIstarion hadn't said it was easy, I would never have come up with it. (From my experience that usually means it's from tLotR.)

Anyway -

But it darkness seems more weighing, to think about everything the lamps.

is Sam in Moria responding to Gimli singing the Song of Durin

But it makes the darkness seem heavier, thinking of all those lamps.