The cactus block and various others are lit more brightly than others.
Environment
Operating System: Windows 8 (amd64) version 6.2 Java Version: 1.7.0_09, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode) OpenGL: AMD Radeon HD 7560D GL version 4.2.12420
This still affects 14w11b, and by this, I mean that the lever/button bug is NOT a shade argument bug, but rather a bug with the "x" rotation argument (it affects any block variant with the "x" argument in its block file).
This still affects 14w10c for torches, redstone torches, beds, and east/west facing buttons and levers.
Also, there should be labels: cactus model lighting shading button lever east west