This verb is only useful for legacy “smart” X10 modules. This verb sends the preset command to the module which will set it’s internal preset level and cause the light level to immediately go to that level.
preset (text, name of a unit)
to level (integer, for X10 devices the preset level is a number from [0-31] as there are that many preset level settings. For other devices that support setting their preset any level can be passed)