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Jeff Deal
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In response to a FOIA request, I recently received confirmation from the FDA that they are continuing to investigate claims made by Xenex that lack adequate support in the literature. Documents released by the FDA show that one phase of the investigation started in October of 2014.
It also confirms that as early as November 2012 the CDC's office of compliance issued a letter to Xenex outlining compliance issues. Subsequently, Xenex removed certain claims but then added others that require further FDA clearance. More information is not available since their is "an ongoing investigation" of Xenex by authorities. 

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Gar Atchison, CEO of Frye Regional Medical Center. "Tru-D is the only UV disinfection system on the market that has undergone a randomized clinical trial conducted by Duke and funded by the CDC to demonstrate the effectiveness of the technology. In fact, since the study's completion, Duke has purchased 11 Tru-D machines for use at their facilities."
http://www.prnewswire.com/news-releases/tru-d-smartuvc-deployed-at-frye-regional-300325272.html


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Pulsed Xenon bulbs (as used by Xenex) significantly less effective than continuous output UV-C bulbs (as used by Tru-D). 

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Interesting. It turns out that Xenex Disinfection is under ongoing investigation by the FDA related to its claims. Some of the complaints go back to 2012, before I had even heard of them.
I am not surprised.



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False advertising suit against Xenex continues. Studies show that pulsed xenon multiples of times LESS effective than continuous UV-C. What may not be well know is that we (the inventors of the Tru-D) rejected pulsed xenon years ago as a method since it is proven to be a VERY inefficient at conversion of electrical power to germicidal energy. Nice idea but failed technology. Plus there is a very real risk of explosion of the xenon bulbs.
In the graph below, kill rates of bacteria are shown with the Tru-D in red and the defective Xenex machine in blue. Pretty easy to see that the Xenon system is way less potent. Keep in mind that these are log numbers, meaning that the differences are scores or even thousands of times different.
The study was done at Case Western Reserve, a very well known research university.

US study compares Pulsed-Xenon UV (PX-UV) with UVC | Bioquell Blog
There are two key families of UV automated room decontamination system: UVC systems, which deliver a continuous dose of UV at a narrow wavelength, and…



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