Lutron LED/CFL Dimmer switch turns lights off the wrong way, up is down and down is up. What's the problem?
You've probably connected one of the 2 power wires to the incorrect traveler terminal on the switch.

This switch can be used as both a standard two-way switch as well as a three-way switch.  (A three-way switch is used when there are 2 switches controlling the same device.)

In standard two-way arrangement, one of the power wires should be attached to the common terminal (this screw is a darker color than the others) and the other power wire should be connected to the terminal on the opposite side of the switch (according to this switch's wiring diagram).  These two terminals are connected when the switch is flipped "up".



The third terminal (on the same side as the common terminal) is used only in three-way configuration.  If you've connected your second power wire here instead, then the device will receive power when the switch is flipped "down" because this is when that terminal is connected to the common terminal.