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    As a result, the costs of devices in the UVC/B range are still very high and can be cost prohibitive in some

    applications. The introduction of the first commercial UVC LED based disinfection system in 2012 has helped to move the market forward to where many companies

    are now seriously pursing LED based products. Precautions A common question regarding ultraviolet LEDs is: Do they

    pose any safety risks? As described above, there are different levels of UV light. One of the most commonly used and familiar

    sources for producing UV output is the black light bulb. This product has been used for decades to produce a glowing or

    fluorescence affect on specific types of posters as well as for other applications such as the authentication of paintings

    and currency.