profilux simu-spot too bright

Hello
I am trying to setup the simuspot according to moon cycle. So far it is working great. However, it is still too bright for the 120gal tank...I adjust the level almost to 10% and it is still bright....Is there anyway that I can do to dimm it down more?..
Thanks
PS: I have moon light from Tunze controller and that intensity is just bright enough to not wakening the fish....Yet I love my profilux controller more so I wanna copy that....:)

then you could reduce the output voltage for the 1-10V interface where the spot is connected to

I will try it out tonight to reduce voltage to 5 and see how it goes.
Thanks Mathias
Joey