"The ExpressLED facial is the draw here, a fantastically efficient fifteen minutes of collagen- and elastin-supporting light therapy. Most treatments consist of a combination of yellow and near-infrared light (longer wavelengths that penetrate skin more deeply and are shown to help stimulate healing and ease pain), but for clients with congestion, courses of bacteria-eliminating blue light are most effective. It's worth making a habit—results are said to be cumulative—and it doesn't hurt that the salon is located inside Harvey Nichols."