Can the lights be turned on and off manually?
Yes. They can be operated manually as well as remote controll. Your choice.
Each Light Measures 2.75" in Diameter and 1" Thick
How many lumens is each Motion Puck
Each light is 100 max lumens.
Are these water resistant?
These are designed for indoor and covered outdoor use. They are not waterproof. That said they should perform well if not exposed directly to the elements.