|Values:||Floating point values: Any decimal number (clearer range should be added in Template:Values).|
Specifies the default amount of ambient light to change on each "step" of ambient light recalculations. When the ambient lighting level in a map is changed via trigger action #73, the map's value (or , if Ion Storm/Lightning Storm is active) is increased or decreased in steps by this amount until it reaches the new level. This amount can be changed with action #71. The default delay between each step is defined by .