Tuesday, 15 September 2020

The Hydrogen Medium/High Pressure Discharge Lamp

Another possible source of PINK light color for esoteric use

NOTICE! This post is NOT documented, it is for LEISURE only.

Q and A - Researchment and general discussion

Depiction of an experimental high pressure
capacitive coupled longitudinal discharge lamp
with annular arc-tube tube and coaxial electrodes

Q - What is it intended to be, how to look like?
A - The medium/high pressure arc-discharge lamp, as in depiction above.

Q - What kind of lamp is it expected to be?
A - Most likely a dielectric barrier medium/high pressure discharge lamp.

Q - You name it 'a source of pink light'. Is it a proof that you will get that pink light? 
A - It might be considered so. In any way, there is the need to collect more data in order to draw a conclusion, or lines for research.
 But, let's no go deeper in technical detail at this time. We do not want go in too much speculation there.

Q - Then, why this post?
A - For the seek of pink light, and the idea itself. And for the seek of research and portfolio of discharge lamps as a whole.

Q - So, what do you consider missing from the class of discharge lamps?
A - As a brief answer, let's consider, the medium/high pressure of H2, N2 and CO2, beside of the noble gases ones.

Q - And from the noble gases class?
A - You have only the Xenon, as a pure gas for high intensity discharges, for lighting. And you have here and there some Krypton arc-lamps, but not for lighting.

Q - Can you give more details about the H2 proposed lamp?
A - Preferable not now, but as soon as we gather useful data, we might have a new post. But, not 'when?'.

Q - Then, can we speak about the others subjects pointed above?
A - As long as we can answer, yes!

Q - Why do you mean, or consider missing, the high pressure N2 and CO2 lamps?
A - Long-time ago, there were some studies about, and claims there were that N2 can emit a yellow-whitish light at certain high efficiency, while the CO2 could emit a nice green light. But we do not have any papers from that, nor would you find some satisfactory now.

Q - Why do you think that development not continued?
A - Don't know anything more about, but probable problems due to electrodes erosion.

Q - And now? Are there greater chances of success?
A - You have now at disposal the dielectric barrier discharge lamp in a more advanced stage of development, so you can use it from start, in case of gases that are not 'noble', and react with electrode material of different composition, especially in hot cathode lamps.

Q - And, in case of noble gases aren't there problems with electrodes?
A - There are also, but not in the same extent.

Q - May we conclude that you also propose the research of a high intensity discharge lamp using exclusively CO2?
A - As the case may be, a penning mixture might be used.

Q - What size do you consider the lamp for research, and what should it be used for, if successful of research?
A - Let's consider it as 250-400W and in the size of ED37, as shown in images. However there is the likelihood that you can not reach the desired power in a certain size of lamp. In no way should it be for general lighting.

Q - And, do you expect to achieve the nice warm greenish light as you heard long time ago?
A - No expectations at these time. The room for speculation is too large.

Q - So, does it seem you seek at a certain extent for, let's say, a kind of portfolio for some discharge lamps using some or certain gases, rather than to achieve a certain 'vandable' product?
A - For this particular case of discussion, we preffer to head more to the 'development' of a certain dielectric barrier discharge lamp, in the form shown in depictions of this post.
 These lamps may seem to give practical results for high pressure excimer lamps in this compact form. So, you can also look forward to test some other gases in this kind of proposed lamps (as objects) and find what comes out.
It might be the case of H2, N2, CO2.

Q - And, are you sure that the dielectric barrier discharge lamp using CO2 will work as you wish, or the CO2 will dissociate, or who knows what else?...
A - You will find it out during the research, as... pleasant or unpleasant surprises. You have to be open to all possibilities...

Q - As for now, what do you consider to be missing from, let's say, the portfolio of the HID lamps?
A - In a brief answer, the rare gases, excepting Xe, and the H2, N2 and CO2 from the others. But, as stated, not from a commercial point of view.

 more content to come...


  1. Spectral intensity of the N2 emission in argon low-pressure arc discharges for lighting purposes

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