Incorporating a hair light

I have been dabbling in studio lighting for some time and now have the extra strobes to be able to add a hair light to my portraits. I have and use a light meter to set all my lights and have a basic knowledge of balancing the individual lights to achieve some modeling effect. The question I have is how many stops under (or over) the key light setting, should I set my hair light? I have a grid for it to control the spread which I think would be an added benefit as well. I have seen some really great portraits posted here where the hair light looks awesome and I hope to achiever similar results in my studio. I have some people coming over who would like some head shots done and I don't want to have to chimp around much when they get here. Any help would be appreciated! Thanks!

color of hair, angle of incidence, along with taste will dictate hair light exposure. I'd start with matching the key light exposure and then chimp accent lights from there.

Dark hair: 1-2 stops higher than the main.

Light hair: 1/2 - 2/3 stop higher than the main.

That's a general rule of thumb. Adjust in small increments as needed.

Thanks for the replies guys....I never would have thought I had to make the hair light brighter than the key light. I will give it a try!