Final answer:
To achieve softer fill light, increase the distance between the light and the subject, use a diffuser or softbox, reduce the light intensity, or use a reflector to bounce light onto the subject for a softer effect.
Step-by-step explanation:
To achieve a less bright, softer fill light, one can employ several techniques. Firstly, you can increase the distance between the light source and the subject. By doing so, the intensity of light reaching the subject diminishes due to the inverse square law of light, which states that light intensity decreases with the square of the distance from the source. Secondly, using a diffuser or softbox on the light source can scatter the light, causing it to spread out and produce a softer effect on the subject. Thirdly, you can outright reduce the intensity of the light source, if your light has such a control setting. Lastly, using a reflector to bounce the light can not only reduce the hardness of the shadows but can also decrease the intensity as some light is lost when it is reflected.