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Low Voltage UV germicidal

Low Voltage UV germicidal

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Here’s an interesting lamp from China, as seen on ‘Big Clives’ Youtube channel. It’s sold as a sterilizing UV lamp but is rated at 10V 3W. Working from such a low voltage it relies on thermionic emission to get started. Shown here it is just at the transition point where the mercury vapour is ionising, but the main current is still flowing through the filament.

Low Voltage UV.jpg small_stuff.jpg GEC_Na_s.jpg GEC_Cd_s.jpg

Light Information

Light Information

Lamp
Lamp Type:Special purpose
Electrical
Wattage:3
Voltage:10

File information

File information

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Filename:Low Voltage UV.jpg
Album name:tuopeek / Low Pressure Lamps
Keywords:Lamps
File Size:334 KB
Date added:Oct 02, 2018
Dimensions:2000 x 1937 pixels
Displayed:96 times
Date Time:2018:10:02 19:24:34
DateTime Original:2018:10:02 19:03:43
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Exposure Time:1/80 sec
FNumber:f 4.2
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Focal length:30 mm
ISO:3200
Make:NIKON CORPORATION
Model:NIKON D3400
Software:Adobe Photoshop Elements 2.0
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rjluna2
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Robert


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Oct 02, 2018 at 02:52 PM Author: rjluna2
That looks cool, Mark

For the circuity point of view, both filament and the gas behaved like parallel circuit. When the current is applied, the lowest resistance is at the filament until the discharge takes place which the lower current flows through than the filament's current.

Pretty, please no more Chinese failure.

dor123
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Oct 02, 2018 at 11:24 PM Author: dor123
It is strange that it is Chinese and not something antique. Thermionic UV lamps aren't manufactured for decades in favor of clear fluorescent lamps made from quartz.

I"m don't speak english well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the European date format (dd.mm.yyyy).

I hope that LED won't replace all forms of other light

Alex
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Mit dem Osten Siegen!


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Oct 03, 2018 at 03:12 AM Author: Alex
Were you got it? Im still looking for one.

Stopt den LED Scheiss -- Machen wir das Gluehlicht wieder Grossartig!

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Oct 03, 2018 at 03:25 AM Author: migette1
Several makers made them, that is a bit larger Philips G-E they were put in air purifiers and wired in series with a little fan which circulated air. These were covered as the UV is dangerous to skin and eyes and you could not see the light. Some aquarium filters use a small lamp I think perhaps like the one shown to pass water over it to kill algae green water. I think they will only work if in series with mains voltage?....peter

Interested in the history of electric lighting and incandescent in particular and neon glow lamps.

migette1
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Oct 03, 2018 at 03:41 AM Author: migette1
Alex go to eBay item no 283063545806 plenty of these bulbs for a couple £s, any problem get back to me as this is on the UK site....peter

Interested in the history of electric lighting and incandescent in particular and neon glow lamps.

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Oct 03, 2018 at 03:23 PM Author: James
Really beautiful photo! I suppose it was quite a short shutter speed, due to the negative glow being only around one filament tail. It seems that your lamp also has quite a huge mercury dose! I wonder if the square object in the centre is a mercury dispenser?
tuopeek
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GLS on Tesla Coil


tuopeek 111967450636623837217 tuopeek1 77334065@N05/
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Oct 04, 2018 at 03:56 AM Author: tuopeek
Thanks, not as short as you would think. The emissivity is not all that equal so it tends to favour an electrode (side) at start-up. Any rectification generated doesn’t bother it, but I noticed if run on a DC supply it will overheat one electrode. Well spotted, the bead of mercury does suggest there is a generous amount in there. I'm not sure if the square is a reservoir or getter.
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Oct 04, 2018 at 04:02 AM Author: migette1
Yes big clive on Y/T thinks that square plate is to hold mercury not a getter

Interested in the history of electric lighting and incandescent in particular and neon glow lamps.

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