Dim Brake Lights

I have Sylvania Zevo (?) 1157 LED brake lights. They have always been kinda dim, but I didn't realize how dim until we almost got rear ended while slowing down to pull into our driveway. The front turn signals are plenty bright, so I don't think it's a voltage problem. I had the same trouble when I still had my '79 back many, many years ago.

Anyone have any upgrades that might help me?
Author: Deano