How do you lower the water in the lighthouse area and main warp room?

I was just wondering if anyone had any ideas or if they knew how to lower the water in those areas, I know you can and I know you have to. I just don't know how. Soooo yeah, if anyone can help me, then thanks.

Solution 1:

In the waterfall room, enter the tetromino code on the pillar to open a door beneath the waterfall. The valve in this room lowers the water across the first warp zone. This is unrelated to the moon door.

Solution:

Enter this code anywhere in the room: ← LT → RT ↑ A ↓ RT RT.

Solution 2:

The secret to lowering the water in that whole area (main warp room, lighthouse, windmill, waterfall, lonely-tree island) lies in the weeping/puking waterfall area. The huge column in that area is what you should be paying attention to.

If you've played the game a lot you'd notice similar columns with similar codes inscribed onto them.

edit: What is Fez's alphabet? that might help you :)