Select the turn the light off before dimming method for dimming lights instead of the brighten the light fully to turn on or dim method. The turn the light off before dimming method is significantly faster because it only sends three commands. The first command shuts the light off. The next command turns the light on to 100% and the last command dims the light to the requested level. Why isn't there a method to turn the light on to 100% and then dim the light, therefore taking only two steps? Because one constraint of the X-10 system is that if a light is already dimmed, then telling it to turn on has no effect – the light stays at the current dim level. Go to the Automating Your Home section of the Online Help Guide or Operating Manual for more information on specifying dim control of lights.
NOTE: Some X-10 compatible light receivers use the Preset Dim or Extended Code methods for dimming lights. These methods have a greater range of control and allow for exact dimming of the light and don't need to be reset between dim commands. For instance, if a light is at 30% and it's told to dim to 75%, the light will go directly to the correct level of luminance, without shutting off or turning all the way on. If the light receiver you're using uses either of these methods for dimming, then specify that method in the Device Wizard screen for that device.