I’m always amazed at how much geometry is involved in lighting a set. Two simple rules will help clarify the way you think about what you’re doing. Don’t be fooled by their simplicity…they’re based on the laws of physics.
The closer you get to a light source, the greater its intensity.
The further away you get, the less its intensity.
It seems obvious because it is. It’s also the basis of the Inverse Square Law. Look it up for further explanation. Once you play around with it for a bit, you’ll begin to understand why we use nets, scrims, dimmers and all manner of light attenuating equipment to control the volume of what’s reaching our subject.