Full Spectrum Lighting versus Broad Spectrum Lighting
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 (C.R.I.) of 90 or above (Outdoor light has a CRI of 100 ) and a kelvin temperature of 5,000 or above. Full spectrum light is described as having a purple or a bluish cast. Most light box companies using full spectrum light bulbs now block these UV rays through their diffuser screen. Make sure they do before purchasing their products.
Broad spectrum light boxes
are often 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.
One of the major safety concern of exposure to light is the possibility of being exposed to ultraviolet (UV) light. Exposure to ultra violet (UV) light can cause sunburn, eye damage and skin cancer. Recent studies have shown that UV rays are not an essential component of light therapy; units that emit almost no UV light are just as effective. Many of the light box manufacturers provide shields to filter away the UV light. Make sure that the unit you buy complies with this.
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