TECHNICAL 1: KEY LIGHT - 45 DEGREE LIGHT LIGHT
Key light is the key light that plays the most important role in the lighting system. The light source from Key light hits the subject at an angle of 45 degrees and down. This light can produce many dark edges.
TECHNICAL 2: FILL LIGHT - DOUBLE BROTHERS OF KEY LIGHT
The fill light is considered to be the twin brother of the Key light because the way the light is placed is tilted at an angle of 45 degrees and located opposite the Key light. The special thing about Fill light is that it illuminates a wider area, the light intensity will be slightly lower than Key light. The light source from the Fill light makes the shadows created by the Key light not too harsh.
TECHNICAL 3: BACKLIGHT
"Back" means at the back, so the Backlight is a light source located at the back, above the head and at a 45-degree angle to the object. A trick for Backlight to make the most of it and turn on the subject when the background is made from materials like fabric. The Backlight light source is extremely useful in the case of people turning black hair on a dark background. Without the back light, black hair would blend in with the background.