Another Ringlight How-To
No more freezing-cold, scantily clad models for him. No, sir.
He's made a pretty good how-to page if you want to try it out.
Don't forget to budget for some good quality UV filters for your lenses, should you decide to use it a lot. Because I am pretty sure this thing would burn you your own, personal hole-in-the-ozone-layer right over your studio.