You can look this solution. I have wrote this for a enviroment as you describe.
https://community.openhab.org/t/timeline-picker-to-setup-heating-light-and-so-on/55564/57
So you have a integration in openHAB and a cool UI.
It’s also possible to control more then one lamp in one widget. Then you must use a proxy item and a additional rule to evalute the state of this proxy item.