It appears this is an older model, but the technology is the same. UV-A light from LEDs is shone onto titanium dioxide and causes a photocatalytic reaction that involves hydroxyl radicals and other reactions that deactivate viruses, bacteria and fungal spores. This version is designed for cars or other small spaces, and is powered by a USB C cable. This unit uses around 1.4W, but a newer version has more LEDs and uses around 2W. In operation it is virtually silent, as it just circulates air at low level through an active mesh. The mesh material may be foamed nickel treated with titanium dioxide. It is apparently much more efficient than the older coated honeycomb materials. The instructions with the unit encourage you to pop the mesh out of its frame from time to time, wash it and then dry it with a hairdryer before putting it back in. Titanium Dioxide is a very common material used in paints as a brilliant white pigment. It is also classed for use in food at low levels, although there is some controversy as to whether it is safe. That includes some suspicious science and rumours about nano-particles getting into children's brains. (Won't somebody think of the children.) It's hard to tell if this science is the product of career narcissists or if it has validity. Especially when you can type in almost any food ingredient and find the same sort of scaremongering. This is one of these things that I can't actually prove whether it works or not without extensive lab testing. The technology does appear to be real, but there's no visible effect, as it is working at atomic level on invisible stuff like bacteria and viruses. I'll try to get one of the new units to compare the insides. If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- http://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty. #ElectronicsCreators ... https://www.youtube.com/watch?v=cOA-qRhaKMA

It's six years since I've looked at one of these, so I thought I'd buy another and see if the construction has changed much. It has changed a bit, but not much. It turns out that even six years ago they were using the new flip chip style LED modules, so the only slight changes are the fact it's now got an earth/ground connection, a six screw cover instead of four and the new driver is not power factor corrected, unlike the original unit which had a very good power factor. (Power factor is the relationship between voltage and current across the sine wave.) These lights are quite nicely made, and it makes me wonder if they're actually used as street lights in some areas of China. They're very hackable for replacing the LED or driver as desired if you have a specific colour requirement. They are also very serviceable in that the LED module and driver are very standard and easily available. Being such a cheap and mass produced item, I wonder how reliable they would be as an actual outdoor light. If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- https://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's algorithm quirks, allowing it to be a bit more dangerous and naughty. #ElectronicsCreators ... https://www.youtube.com/watch?v=Rw8QlKs03fw