Broad Spectrum VS Full Spectrum Lights

The NorthStar 10,000™ is a broad spectrum light. With our brightness level of 10,000 lux at two feet, the NorthStar 10,000™ is effective, easy and safe to use!


Full Spectrum
Broad Spectrum

Full Spectrum

Full spectrum light bulbs are made to try to imitate natural sunlight, and like sunlight, they also produce UV rays. Typically full spectrum bulbs 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. 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

Broad spectrum light boxes are described as being as close to full spectrum 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 bulb so that there is no danger of UV rays.

Light therapy with a NorthStar 10,000™ can make your winters happier, healthier, less stressful, brighter and UV FREE!


Actual Client Testimonials

"My busy time arrives in the winter months and since I'm a tax preparer/accountant I need to be in top form. I live in Alaska where even on sunny days there isn't much sun and It's often cloudy or snowy or rainy and really, really gloomy. Without my light I'm can be a basket case. Just turning it on in the morning will notch my mood up several degrees and since I started using it as the days began to shorten I didn't have the going into the dark blues. I can't imagine trying to function without my light anymore."

Judith L. | Homer, AK
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