It is difficult to find a modality that is more useful and versatile for an aesthetic practice than LED light therapy. A results-oriented LED device can improve the outcome of almost any service, increase income through new services, retail and rental initiatives, and increase referrals from satisfied clients. With the bewildering number of new devices hitting the market, it's more important than ever to understand exactly what makes LED devices effective. Being able to distinguish the marketing hype from the scientific parameters will make the selection process much less intimidating. There are basic guidelines based on proven scientific principles that apply to all LED brands.