What you have to say about this: https://www.mea.lighting.philips.com/consumer/disinfection

That's a genuine product. The UVC table lamp is a PL type germicidal lamp and the safety system, although overkill for those of us who know about these things, is good.

The LED ones are clearly stated not to be germicidal UVC and do not work with viruses.

All in all, quite good, although probably not cheap. I'll stick with this 

Edit - I've found a UK price for the UVC one, £110 at Argos.

Are these researches that proved that blue light can disinfects beside destroying the eye retina?

The UVC one is a genuine germicidal lamp, so I'd say yes. The website does give some detail in the FAQ section.

The LED one I don't know, I didn't check. It may well be effective against bacteria, but it definitely won't work with viruses.

I believe that LED lamps in general are unsuitable for germicidal applications because I do not think they use UVC.

You're right, they don't. The UVC product in this advert is a PL type germicidal lamp in a very expensive housing. Looking at the specs, it doesn't even look as if the lamp is user-replaceable, so when it fails, it's an expensive replacement once it's out of warranty

Indeed, Signify designed their tabletop unit specifically to be a throwaway item.  I took one apart and found that they have even saved the cost of a lampholder, by soldering the four pins of the lamp directly to the PCB of the electronic ballast in the base!  Even the cheap alternative devices generally allow the customer to replace the lamp when it fails, although it may be necessary to undo some screws to gain access.

If there is the very cheap CFL style ballast, it will get fried once the lamp starts failing. So having the lamp replaceable won't help, you would have to replace the ballast as well. Even more when such socket contacts are notorious for making troubles by themself, mainly when the thing is used not that often (practically the sgelf life of all the things is shorter than the lamp operating life with the anticipated use pattern of such product).

You may argue the germicidal EOL is many times sooner than it actually fails electrically (so needs to be replaced way before it poses danger for the ballast), but that would assume the user will dilligently track the usage and replace the lamp at the specified hours. Don't think anything like that would ever happen with a home use device, operated by general people. Mainly when first it often does not happen at many places where it is handled by "proffessionals". And as second, I doubt that would happen when a replacement lamps tend to cost the same or even more at retail (so where the general public xan buy it) or it isn't distributed there at all.

@James -Ye gods, how much does a lampholder cost..? I've heard of penny pinching, but this is ridiculous, especially on a £100+ item 

Now would actually mark my 2nd anniversary of obtaining a UVC tube because of well the p word that has disrupted our lives for nearly 2 years 

It was a Philips 18W one and it was used in my 2ft weatherproof fixture that is wired up to a mains plug. It was my effective way of disinfecting a room that's unoccupied because I thought wipes, disinfectant sprays and sanitizers will not be enough to defend myself and my parents from getting infected - which I'm glad to say it has paid off so well 

I know that even with LEDS that can produce UV, they are nowhere near the strength of a discharge mercury filled lamp made of quartz glass. If you can't smell the ozone then your fancy LED version of a germicidal lamp is not doing its job