…the right light.
In photography there are many reasons to use flashguns, wich are great if you only want to see what your lighting looks like after taking a shot. If you want to see what you shot will look like while you compose it in the viewfinder or on a viewing screen, then you have to go for continuous light.
The Photometric mismatch between a modelling light and the actual flash, as well as the limitation of our ability to perceive the performance of an extremely short flash duration, are convincing reasonsto use continuous light in light modelling.
In addition, it is possible in a professional digital camera or back to adjust colour temperature settings in steps of 50 Kelvin. This means you can achieve specific colour nuances by using colour temperature settings that are different from the norm without any filter or light loss. This increases the number of possible individual effects. A lower light intensity and fewer accessories suffice to generate results for which a higher light intensity would be necessary in analogue photography.