To control lights in YafaRay, select the light source and go to the Objects tab. There we will find a contextual menu that shows options related to an object based on its nature. For instance, if we select the Area Lights, these will be the options displayed:
Select each lamp and change the settings to the following:
Type: Area
Power: 0.7
Make light visible: On
Samples: 10
Color: White
This will set the light as Area Lamp recognized by YafaRay with an intensity of 0.7 units. The samples setting will add more quality to the soft shadows created by the lamp. In the end, we will have the color of the light, which will be white to create a clean and bright light environment for the studio. Apply the same settings to both lamps.