Full spectrum light bulbs are made to try to imitate natural sunlight, and like sunlight, they also produce UV rays. Full spectrum light is described as having a purple or bluish cast. Most light box companies using full spectrum light bulbs now block these UV rays through their diffuser screen, it’s good to check to be sure.
Broad spectrum light boxes are described as being as close to full spectrum as you can get without the UV rays. Broad spectrum light bulbs are described as being a pure white light. Most light box companies use a broad spectrum light bulb so that there is no danger of UV rays.
Research has shown that in light therapy, the light’s intensity is the key, not UV rays. UV rays are considered a liability and a health problem with the eyes and skin. Our light box produces no UV rays. The North Star 10,000 is a broad spectrum light. With our brightness level of 10,000 lux at two feet, the North Star 10,000 is effective, easy and safe to use!