Not all types of laser lights are safe to use. Some disc lamps are more powerful and brighter than others and thus have a different level of impact on the users and people in their surroundings. At times the powerful beam can overwhelm the eyes and cause saturation of retinal pigment resulting in flash blindness (or temporary visual impairment). It generally lasts from a few seconds to a few minutes. Apart from such occasional issues, these lights are completely safe to use. However, it is always a great idea to read the user manual before using these devices.