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After 6 days of use: Sodium line disappearing

After 6 days of use: Sodium line disappearing

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When the Odyssea MHQ-T 70W 6500K aquarium MH lamp was completely brand new, there was a sodium D line that appeared left of the mercury yellow lines, as an impurity from the quartz:
https://www.lighting-gallery.net/gallery/displayimage.php?pos=-182317

Today, after letting the lamp to stabilize, I've checked the spectrum only to see that the sodium D line completely disappeared.

Why this is happened?

IMG_084620resized.jpg Spectrum20of20Odyssea20MHQ-T206500K2070W20resized.jpg IMG_077120resized.jpg IMG_074420resized.jpg

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Filename:IMG_077120resized.jpg
Album name:dor123 / Spectra of light sources with my discs
Keywords:Lamps
File Size:152 KB
Date added:Jul 21, 2020
Dimensions:1556 x 1167 pixels
Displayed:39 times
Date Time:2020:07:21 19:49:55
DateTime Original:2020:07:21 19:49:55
Exposure Bias:0 EV
Exposure Time:1/80 sec
FNumber:f 5
Flash:No Flash
Focal length:15.118 mm
ISO:200
Make:Canon
Model:Canon PowerShot SX730 HS
White Balance:1
URL:https://www.lighting-gallery.net/gallery/displayimage.php?pos=-182668
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dor123
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Jul 22, 2020 at 09:48 AM Author: dor123
Update 22.7.2020: The sodium D line has been reappeared:

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 European date format (dd.mm.yyyy).

I lives in Israel, which is a 230-240V, 50hz country.

dor123
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Other loves are computers, office equipment, A/Cs


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Jul 23, 2020 at 05:29 AM Author: dor123
Update 23.7.2020: Looks like the sodium D line varies in brightness. Sometimes it is weak and sometimes it gets stronger, and sometimes disappearing completely. Why this is happening?

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 European date format (dd.mm.yyyy).

I lives in Israel, which is a 230-240V, 50hz country.

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