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The True Spectrum of Neon

The True Spectrum of Neon

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A well-made mini Neon sign reveals that there is not a single Blue, Violet or Near-UV emission! I compared it to a modern tri-phosphor mini fl strip-lamp. The coating + glass of the fl strip blocks the 365nm UV line very well.

Globe-60wBlackLight.jpg GE-blacklight.jpg Neon-vs-fl-lamp.jpg Ampoule-colors.jpg

Light Information

Light Information

Manufacturer:Made by a Russian
Lamp
Shape/Finish:Ne
Fixture
Ballast Type:3.5kv Gas Tube power-supply
Electrical
Wattage:about 5-7w ?

File information

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Filename:Neon-vs-fl-lamp.jpg
Album name:lights*plus / Lamp Spectra
Keywords:Miscellaneous
File Size:949 KB
Date added:Dec 23, 2015
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Globe Collector
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Mar 24, 2016 at 12:43 AM Author: Globe Collector
Neon does have some UV lines, but far down in the UVC part of the spectrum, so they will not pass the glass and be seen in this set up.
At 257nm, there are only three things which I know transmit it...quartz, water and air...and in air it is limited to how far it can travel...about 90% attenuation within 20 meteres I think.
At 186nm even air becomes an issue as this wavelength possesses enough energy, (see Plank's Equation), to break oxygen molecules into free atoms (which react with the O2 molecules to make ozone). At 170nm even water starts to become opaque and at 160nm quartz has gone black also.

Manufactured articles should be made to be used, not made to be sold!

Fee, Fye, Fow, Fum, A dead man's eye and a parrot's BUM!

rjluna2
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Mar 24, 2016 at 06:38 AM Author: rjluna2
I have always find light physics fascinating with all the materials use in transmission. I have took High Frequency System in one of the Electrical course a couple years ago and was able to learn that the impedance of the air is about 377 Ohms

Pretty, please no more Chinese failure.

Globe Collector
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Mar 24, 2016 at 06:34 PM Author: Globe Collector
How was that figure of 377 Ohms derived? Was it a capacitive reactance in some sort of unitary test capacitor, using air as a dielectric, or was it derived directly from the dielectric properties of the air.

As air is an insulator, this would not be a resistance...it would have to be some sort of AC reactance.....or was it the resistance per some unitary length of an arc's plasma in air?

Manufactured articles should be made to be used, not made to be sold!

Fee, Fye, Fow, Fum, A dead man's eye and a parrot's BUM!

rjluna2
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Mar 24, 2016 at 07:58 PM Author: rjluna2
No, Andrew. You can find this information at Wikipedia's https://en.wikipedia.org/wiki/Impedance_of_free_space The air is indeed one big capacitor between the vacuum and the earth ground. That's why we have lighting

Pretty, please no more Chinese failure.

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Mar 25, 2016 at 03:27 AM Author: Globe Collector
Oh, I see, it is treating free space as a "transmission line"...so it is sort of like a transmission line impedance...

Manufactured articles should be made to be used, not made to be sold!

Fee, Fye, Fow, Fum, A dead man's eye and a parrot's BUM!

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