I have a Spot simulation* PL-0355 for /moon /sunset /storm. It is on ports L1 (moon) and L2 sunrise/set. Both channels are timed to switch on and then completely off twice daily at the start and end of main lighting period as is the norm.

However in the middle of the night when all the lights are timed to be off with 0% power, I have noticed that the white centre lights and blue moon lights cycle in intensity (like a sine wave) over about 5 seconds constantly. this has become anoying as I want full control and would like the aquarium to be in total darkness in the middle of the night.

1-10v interfaces.jpg ill 1.jpg ill 2.jpg

is this a clue:-

pumps sine wave.jpg
as the pumps can follow sine wave

but still do it when output is altered to a square wave:

pumps.jpg

Can anyone help?