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Author Topic: Interesting spectral phenomenon in coloured metal halide lamps  (Read 2486 times)

Offline dor123

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Interesting spectral phenomenon in coloured metal halide lamps
« on: February 25, 2010, 09:00:41 am »
In the blue/high CCT and the green MH lamps spectra i found that the spectral lines of the indium (Blue and high CCT MH) and the thallium (Green MH) are dominant in the spectra from the moment the lamp is turn on (Like in the case of the run-up spectrum of a HPS lamp) unlike white MH lamps that these lines are not appearing in the spectrum during warm up but only after the mercury is reached its optimal pressure and intensity. This phenomenon is also occurs with the indium line (But not with the sodium line) in pink MH lamps. What cause the phenomenon?
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I"m don't speak english well, and i relying on Google Translate to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

Philips will be banned soon by me, because they accounts in great part for the bulb/ballast bans.

Offline dor123

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Re: Interesting spectral phenomenon in coloured metal halide lamps
« Reply #1 on: February 26, 2010, 05:31:34 am »
Why anyone don't answers me?
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I"m don't speak english well, and i relying on Google Translate to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

Philips will be banned soon by me, because they accounts in great part for the bulb/ballast bans.

Offline rjluna2

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Re: Interesting spectral phenomenon in coloured metal halide lamps
« Reply #2 on: February 26, 2010, 07:56:29 am »
I guess they haven't gotten an answer to you question yet.  Be patient ;)
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Offline dor123

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Re: Interesting spectral phenomenon in coloured metal halide lamps
« Reply #3 on: March 05, 2010, 09:09:45 am »
Why anyone don't answered my first question about the spectra of coloured MHs for more then one month?
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I"m don't speak english well, and i relying on Google Translate to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

Philips will be banned soon by me, because they accounts in great part for the bulb/ballast bans.

Offline lights*plus

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  • Posts: 57
Re: Interesting spectral phenomenon in coloured metal halide lamps
« Reply #4 on: November 03, 2011, 03:05:39 am »
Here's a very late reply that might fall on deaf ears.

From what I know.. Different lamps have different arc-starters in the arc-tube, typically xenon and mercury, which contribute their light at startup. It may happen that the thallium & indium in these M-H lamps are the arc-starters. This type of lamp however is rare. The very common M-H with sodium, mercury & scandium, ignites with the aid of mercury, followed by sodium and lastly the scandium lines appear.
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