Henrik, thanks for the reply and suggestion.

The pulsing only occurs when the conditions are matched for the start of the lighting phase. For example, if the lighting period is set for an hour between 10:00 and 11:00, with a 5 minuet fade up and fade down times, this pulsing happens on C.2 when the time is => 10:00 and <=11:00. But the intensity of the LED fades up correctly between 10:00 and 10:05 and down correctly between 10:55 and 11:00. The thing that really perplexes me is that C.1 works as it should with the LED increasing in brightness, stays lit at full brightness and then fades down until turning off at the set times