Broad spectrum light boxes are described as being as close to full spectrum lighting as you can get without the UV rays. Typically they have a CRI. of around 82 and a kelvin temperature of around 4200. Broad spectrum light bulbs are described as being a pure white light. Most light box companies use a broad spectrum light therapy bulb so that there is no danger of UV rays.
Full spectrum light bulbs are made to try to imitate natural sunlight, and like sunlight, they also produce UV rays. Typically full spectrum lamps have a Color Rendering Index (CRI) of 90 or above (100 is actual outdoor light) and a kelvin temperature of 5,000 or above. Full spectrum light is described as having a purple or bluish cast.
All Alaska Northern Lights products are broad spectrum lights. Our light therapy devices can make your winters happier, healthier, less stressful, brighter and UV FREE!