An intensity file contains lighting effects for a sequence, but not in the same way as the main sequence file. In a sequence file, effects are defined with high-level descriptions. For example, a sequence file might say that a certain channel is supposed to fade up from 0% to 37% over the course of three seconds starting seven seconds into the sequence. An intensity file instead stores raw intensity values at all points in time. Using the same example, the intensity file would contain something more like, "Intensity 0 at time 3.00, intensity 0 at time 3.01, intensity 0 at time 3.02, ... intensity 1 at time 3.19, intensity 1 at time 3.20, ..., intensity 37 at time 10.00". This allows intensity files to be very efficient during play, and so can be helpful with designing shows with very large channel counts.
Intensity files are created by the Light-O-Rama Sequencer and can only be used with a Pro license. Each intensity file is associated with a sequence file, and the effects from both the intensity file and the "main" sequence file will be played whenever the sequence is played. The filename of the intensity file used by a sequence (if any) is determined by the filename of the sequence itself, by appending ".pe.lid" or ".ss.lid" (depending on whether it was created by the Pixel Editor or by SuperStar, respectively) to the sequence file name. For example, if you have a sequence named "MySequence.lms", then its intensity files (if any exist at all) will be named either "MySequence.lms.pe.lid", "MySequence.lms.ss.lid", or both. They must be in the same directory as the sequence file.
Only effects for Light-O-Rama controllers and for native DMX devices can be used in an intensity file. Also, if effects for Light-O-Rama controllers are used, they must be on enhanced Light-O-Rama networks.
The Light-O-Rama Comm Listener must be running in order for effects from an intensity file to get to the actual lights, which means that the Light-O-Rama Control Panel must be running (the Light-O-Rama Control Panel is responsible for making sure that the Light-O-Rama Comm Listener is running).
If a sequence with any associated intensity files is used as a subsequence, its intensity files will be ignored. Only intensity files associated with the main sequence will be used.