Old 06-07-2016, 03:42 AM #17
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Default Re: Ph!l!ps Germicidal Lamps excited by the tesla coil.

DWU I can put you in touch with Carl Willis who made my *really* good tubes. They're not cheap though. He does custom gas mixes and has pioneered xenon eximer gas mixes for electrodeless tubes. Just hit me on email if you want his info.


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Old 06-07-2016, 05:39 AM #18
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Default Re: Ph!l!ps Germicidal Lamps excited by the tesla coil.

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Originally Posted by Down with Umbrella View Post
a common incandescent bulb(argon)
Have you verified it is argon from the spectral lines?

I'm pretty sure nitrogen is a lot more common because it is cheaper. Xenon or krypton is sometimes used because of its insulating properties that increase efficiency, but it is only really used in halogen lamps, or flashlight bulbs. The flashlight bulbs are labeled as such.
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Old 06-07-2016, 02:32 PM #19
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Default Re: Ph!l!ps Germicidal Lamps excited by the tesla coil.

It's possible it could be nitrogen. I know they use an inert gas to prevent the tungsten from oxidizing. From what I read argon, nitrogen, Are used in some circumstances a mixture of both.https://www.quora.com/Which-gas-is-u...-electric-bulb

When I compared the color perceived from the bulb it looked like that of discharge samples online for Ar tubes. Nitrogen does have a dim purple glow too under similar conditions.

Last edited by Down with Umbrella; 06-07-2016 at 02:42 PM.
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Old 06-10-2016, 01:11 AM #20
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Default Re: Ph!l!ps Germicidal Lamps excited by the tesla coil.

It can be nitrogen, argon or a mixture in 'standard' incandescent bulbs. It really makes little difference, argon is not an expensive gas.

Krypton and xenon were used for a marginal gain in efficiency due to lower thermal conductivity, but such xenon bulbs should not be confused with xenon lamps that you now find on cars, in projectors, and such: those are actually discharge lamps, not incandescent at all.
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Old 06-10-2016, 05:37 AM #21
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Default Re: Ph!l!ps Germicidal Lamps excited by the tesla coil.

Benm, is hydrogen a feasible gas for a lamp? A magenta effect would be fascinating. I'll have to research more as to what pressures would yield this desired effect.
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Old 06-10-2016, 05:52 AM #22
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Default Re: Ph!l!ps Germicidal Lamps excited by the tesla coil.

The dominant visible lines for hydrogen are 656.3nm, 486.1nm, 434.1nm and 410.2nm. There are also some UV lines as well. The last being 364.6nm.
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Old 06-11-2016, 01:41 AM #23
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Default Re: Ph!l!ps Germicidal Lamps excited by the tesla coil.

Hydrogen can certainly be used to create gas discharge lamps, although the output power is limited.

Deuterium is used for light sources in uv-visible spectrometers. It as a similar spectrum to hydrogen in the near uv but emits more powerfully. In spectrometers the 200-400 nm range is often powered by a deuterium lamp while something else (possibly just halogen) is used for the visible range.

You want the continious emissions here, not the peaks, as those make it more difficult to zero the spectrofotometer reliably.

I guess one could construct a hydrogen discharge lamp just for the experiment, and without the need for deuterium. From an elecrical standpoint they should be similar and run from the same power supply, albeit with lower uv intensity for the hydrogen one.
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Old 06-11-2016, 02:50 AM #24
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Default Re: Ph!l!ps Germicidal Lamps excited by the tesla coil.

Quote:
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such xenon bulbs should not be confused with xenon lamps that you now find on cars, in projectors, and such: those are actually discharge lamps, not incandescent at all.
Funny you should mention mis-characterization, because the lamps used in car headlights are not xenon lamps. They are metal halide lamps. The lamps in consumer-grade projectors are not xenon lamps. They are ultra-high pressure mercury lamps (UHP for short).
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Last edited by Cyparagon; 06-11-2016 at 02:53 AM.
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Old 06-12-2016, 01:31 AM #25
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Default Re: Ph!l!ps Germicidal Lamps excited by the tesla coil.

That's odd too indeed, those 'xenon lamps' on cars actually are HID lamps that don't really rely on xenon for light production at all after inital startup. I'm not really sure where that term came from, but i suspect some marketing thing - xenon probably was fashionalbe when they were first introduced, and they do contain xenon after all.

I suppose actual xenon short arc lamps would actually make really good light sources for car headlights, but they may be a bit expensive for that, and perhaps won't deal well with the vibrations and shocks either.

They are used in cinema projectors though.
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