Originally posted by Sin I AM
Based on what then? I always thought of them as twenty gallon tank of gas, and by adding another ring you'd essentially be adding another tank...
No. It's an amp. Read Emerald Twilight issue 2. You can visibly see the difference in the amount of power Hal was wielding from the beginning to the part of the story where he dropped them all.
He goes from the beginning with one ring, all his constructs and bubbles are clean slightly glowing lines. To the later he has a fistfulls of rings and is just arcing energy in all directions in a massive radius around him like a supersaiyan. Even his fist looks like he's carrying a lightning storm rather than the soft glow of a single lantern ring.
As he's running through lanters and collecting the rings, fights go from PAGES long battles, to single panels, even though he's fighting tougher and tougher competition.
When he encounters Kilowog, he says "You can't beat me Kilowog, you can see how I'm armed.", -- Kilowog doesn't even pose as a threat.
Later, when he encounters Sinestro. Sinestro says his victory is a "forgone conclusion" when he's wielding that much power. So Hal takes them off.
More rings. More power.