The quality of a therapy device is based on three main variables: 1. Irradiance: This is a measure of the intensity coming from the light. A reputable company should give you these measurements at varying distances. If they don’t, chances are they’re hiding something. 2. nnEMF: Also known as non-native electromagnetic frequencies, these are the fields of radiation surrounding a man-made object. A high power device, such as those in the MyLight range, allows you to be further away from the device, protecting you from EMFs. 3. Flicker: Flicker in light is the rapid, repeated change in brightness that comes from a change in voltage. Flicker may be associated with headaches and eye strain. House wiring uses alternating current (AC), which produces flicker. Our devices contain a driver to convert the AC to direct current (DC), thereby blocking any potentially harmful flicker.