Giving away this Deadly Silent Wolf to the first person who answers this question correctly

An old man was dying, and he said to his three sons "who ever can find something small enough to fit in their pocket but can light up the whole room inherits my money" the three sons, eager to gain the money, go on a quest to find something to light up the room but would fit and their pockets. The first son had brought a flashlight, but when he turned it on it only lit up a tiny portion of the room. The second son brought fairy light, but when he turned them on, it lit up a small portion of the room, but lighter than the first son. The third son finally came back with something in his pocket, it filled up the whole room and he inherited the money. What did he bring?

A match? So the son can light the whole room on fire?

Pssh, no lol, but good guess!

A smile?

Nope, but that's honestly a nice answer lol

I was thinking of the saying "his/her smile lit up the room" but then it occurred to me that you can't put your smile in your pocket lol. Hindsight xD

Lol, you can take another guess lol

A candle, perhaps?

No, but your are a bit close :3