OnSpark<BASE, SPARK_COLOR, MILLIS> OnSparX<BASE, SPARK_COLOR, MILLI_CLASS> OnSparL<SPARK_COLOR, MILLI_CLASS>
When you turn the saber on, it starts with SPARK_COLOR, and then fades to BASE over a peariod of MILLIS millseconds.
https://github.com/profezzorn/ProffieOS/blob/6f8add544c627172ad2dd698c90e5e55078a420a/styles/on_spark.h#L4