Globe brand disinfection bulb showing up in stores

PhotonWrangler

Flashaholic
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Oct 19, 2003
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A small rant about this bulb that's showing up in a number of retail and DIY stores lately. It is marketed as an NUV disinfection bulb.

The truth is that there is some solid science behind the disinfection action of wavelengths between 400-460nm by inducing oxidative stress in bacteria. Some but not all bacteria are susceptible to damage from blue light irradiation, and this can be helpful in the food industry in particular.

The problem is that this is not applicable to viruses at all. Viruses are much smaller than bacteria and are not technically living organisms. They can only be deactivated (not "killed) by shortwave UVC. The shortwave energy in a UVC lamp is able to break apart cell membranes of viruses, which kind of disassembles them. NUV can't do this.

But this NUV disinfection bulb contains artwork on the back of the box that is misleading. It includes depictions of coronaviruses as well as other microbes, implying that this product can be effective against viruses. NUV lamps cannot do this.

NUV_bulb.jpg
back_of_box.jpg
 

Dave_H

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Ottawa Ont. Canada
I picked up one of these a year or so ago, not for germicidal purposes, but to check usefulness for near-UV fluorescence. I would not have payed the going regular price at the time $13-$15 IIRC.

It has so much visible light that fluorescence effect is not great. Looks like a regular blue/white visible light.

Ability to flip between regular and UV modes is mildly useful. It could be used as regular porch light, flip to UV to light up Hallowe'en costumes..except that the current LED porch light in use is a 100 lumen, 0.9W filament bulb from Ikea which does a surprisingly good job on a small porch. The combo bulb is actually overkill.

Agreed that packaging implied usefulness is a bit dodgy. Marketing looks a bit overboard.

I guess I need to go find me some bacteria (but not viruses)(not that it should be so hard)!

Dave
 

KITROBASKIN

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Scrutiny of your images indicate that it takes 3 hours and no more than 9 feet away for germicidal activity. The artwork to me looks to deceive about virus effectiveness, but the words do not say that; only 'other harmful pathogens' (some definitions include viruses as a type of pathogen). If I were to look at that drawing without context, the guess would be some of the elements look like pollen grains.
 
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Dave_H

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Nov 3, 2009
Messages
796
Location
Ottawa Ont. Canada
I am finding several Globe brand small UV sanitizer products on sale $10-$15, apparently surplus, at a local
Canadian store chain. Looks like possible over-estimated demand, although COVID is not gone; or some other reason as I find these still online at much higher prices.

They are mostly LED but at least one has miniature UV tube. No plans to buy them all to evaluate
despite their low price, but did pick up product #66461, handheld 254nm tube which runs from 4xAAA or USB.

This model has orientation switch which only allows operation pointing down i.e. normally away from eyes, and a timer. Its flat tube appears fairly dim, no filter so fluorescence effects suffer a lot of visible. It does light up the border of Canadian postage stamps as does another stronger UVC lamp. No opinion on its efficacy for intended purpose.

Another small handheld version product #66464 uses single LED, internal battery with USB recharge.

The LED versions use square SMT devices with gold finish.

Dave
 
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