VMB4PD & VMB1TC - lights

Somebody who can help me?

I installed these two panels so they light up from 6PM till 10PM. But one of them always stop lighting up around 9.30PM. Why does he do this? VMB1TC is configured as headclock.
Is it also possible that they light up from 6PM to 10 PM and from 5AM to 8AM?

hi JonasD,

did you check if the two panels (vmb4pd and vmb1tc) displays the same time?
have you syncronised the time on the two panels?
look with velbuslink at the parameters of the two panels if there is a difference in the settings for backgroundlighting (time and value (on,off,low, medium or high)