dor123
Member
Offline
Gender: 
View
Posts
View Gallery
Other loves are computers, office equipment, A/Cs
|
| Despite the spectrum contains mainly thallium and rare-earths, I sometimes see bright pink flashes during run-up of this lamp in my floodlight. Also during analysing the spectrum during run-up, I see some sodium and lithium emissions.
What is the actual halides chemistry of my Sylvania Metalarc HSI-TD 70W/D UVS Rx7s?
|
|
|
|
Logged
|
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 international date format (dd.mm.yyyy).
I lives in Israel, which is a 220-240V, 50hz country.
|
lights*plus
Member
Offline
Gender:
View
Posts
View Gallery
George Liv Photo
  
|
I'm not sure which is your lamp compared to This PDF file. Only one in here has mercury-thallium & rare-earths, the HSI-TD/D (this yours?). The others HSI-TD/WDL HSI-TD/NDL are Sc-Hg-Na lamps (peaks in the spectra at about 475nm & 508nm). But of what you describe, I have also seen red or pink flashes at runup with many types of hid lamps. In particular the Sc-Hg-Na lamps do it! I have concluded that it is either how the more difficult halides finally become dissociated from the iodine compound, and that's what you see. Or it could be that a little of the lamp electrodes become vapourized at that time. I have bumped clear mercury vapor lamps (not at startup) and was alarmed at the bright red flashes. This contrasts with the blue-green light of the MV lamp & is a little shocking. Try bumping or tapping your lamp & see what happens. |
|
|
|
Logged
|
|
dor123
Member
Offline
Gender:
View
Posts
View Gallery
Other loves are computers, office equipment, A/Cs
|
This is exactly my lamp the HSI-TD/D. This is the best photo of the spctrum that I could capture with my camera and my disc. |
|
|
|
Logged
|
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 international date format (dd.mm.yyyy).
I lives in Israel, which is a 220-240V, 50hz country.
|
marcopete87
Member
Offline
Gender:
View
Posts
View Gallery
|
|
|
|
|
Logged
|
|
dor123
Member
Offline
Gender:
View
Posts
View Gallery
Other loves are computers, office equipment, A/Cs
|
| The pink flashing occurs when the lamp is green from the thallium, and the rare-earths begins to ionise, so it can't be the argon starting gas. This not always occurs, but if it occurs, it happens only one time.
Update: I didn't chekced the spectrum of the lamp with my disc, after turning it on, and it did one pink flash, but didn't managed to see what happened in the spectrum during that pink flash, as it was too short.
|
|
|
« Last Edit: December 19, 2015, 03:52:21 AM by dor123 »
|
Logged
|
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 international date format (dd.mm.yyyy).
I lives in Israel, which is a 220-240V, 50hz country.
|
lights*plus
Member
Offline
Gender:
View
Posts
View Gallery
George Liv Photo
|
| Yea I think if you can catch the spectrum of those brief pink flashes then you got your answer. I'll try to remember to catch these myself. I've noticed that it occurs more with newer lamps. If continuous, then something is very briefly incandescent, such as parts of the electrodes(?). If they are spectral lines then another explaination is in order, such as the red lines are more intense at the moment the scandium or rare-earths are dissociated. Interesting project.
|
|
|
|
Logged
|
|
James
Member
Offline
Gender:
View
Posts
View Gallery
|
| Depending on how old it is, it is most likely cadmium you are seeing, which has a fairly strong red line. Normally that is overpowered by the blue lines of cadmium but during run-up may give the impression of a momentary red-shift, even though the light does not actually become red. Until recently the Sylvania metal halide lamps were dosed with mercury-cadmium amalgam, instead of the more typical pure mercury filling.
Some also contain a small amount of hafnium metal but if I remember rightly only in the higher wattages. That helps with improving the CRI due to its blackbody-like radiation which is quite rich in red. The hafnium forms small particles that are heated to incandescence in the arc.
|
|
|
« Last Edit: December 19, 2015, 09:13:54 AM by James »
|
Logged
|
|
dor123
Member
Offline
Gender:
View
Posts
View Gallery
Other loves are computers, office equipment, A/Cs
|
I see only mercury and thallium lines during run-up. If my lamp would be dosed with a mercury-cadmium, I would see both mercury and cadmium lines during run-up, but this isn't the case. When I turns the lamp off, I indeed see small particles at the bottom of the arctube, afterglowing red with the arctube itself and its electrodes: http://www.lighting-gallery.net/gallery/displayimage.php?pos=-114507 . |
|
|
|
Logged
|
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 international date format (dd.mm.yyyy).
I lives in Israel, which is a 220-240V, 50hz country.
|
dor123
Member
Offline
Gender:
View
Posts
View Gallery
Other loves are computers, office equipment, A/Cs
|
| Found the lines that causes the pink flashing during run-up. Several lines in the orange that don't looks like sodium D double line flashed during the run-up (The flash was weak in this capture).
Video of an animated spectrum of the lamp, with the lines that causes the pink flash during run-up will follow.
|
|
|
|
Logged
|
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 international date format (dd.mm.yyyy).
I lives in Israel, which is a 220-240V, 50hz country.
|
dor123
Member
Offline
Gender:
View
Posts
View Gallery
Other loves are computers, office equipment, A/Cs
|
|
|
|
|
Logged
|
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 international date format (dd.mm.yyyy).
I lives in Israel, which is a 220-240V, 50hz country.
|
lights*plus
Member
Offline
Gender:
View
Posts
View Gallery
George Liv Photo
|
| Ok I copied dor123's video onto my pc & played it over & over. For the pink flashes dor12 is pointing out..At the moment the rare-earths begin to radiate, it's possible that one or a few of the rare-earths are briefly stronger than the rest (they are a few rare-earths and can't imagine ALL start to radiate at the same pressure+temp). I noticed that the red lines remained. Within a fraction of the second, when the blue & green radiating elements start radiating, the red ones might be getting suppresed until a stable cycle is established.
|
|
|
|
Logged
|
|
