A hair light is another addition you can add to your portrait setups and it is a matter of taste as to whether you do this or not. The hair light can often add the sparkle to a portrait and help the subject pop off the background. They can make your subject look better, the portrait more professional, and this subtle detail can often please your client. Of course, they would not work for a subject who was bald or had to much thinning hair.Join Great Photography Courses today. Get instant access to this course.