I replaced mine with 6, just one of them is a lot brighter than all 12 or whatever that were there stock . Click the link in my sig to see.LED's work well when you put a LOT of them together. A lot of eBay taillight brake and turn signal LED gigs only have a half dozen LED's in them. Needless to say they don't put out that many lumens. You can't make them any brighter (short of putting higher mcd LED's in, but that requires you to remove EACH individual LED and solder in the brighter ones). Heh.
With 50 brake LED's lit up notice how it's still not even as bright as the ONE brake light bulb? Albeit they are spaced out whereas the bulb is focused in a small area.
To the OP, I would revert back to stock in the meanwhile or get something better. Stock might be cheaper to buy off someone..