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Strange transparent spot at the arctube of my 8000K 70W MH lamp I've noticed recently that there is a transparent spot at the right down part of the arctube (Marked by the red arrow) of my 8000K 70W MH lamp. What it is?

Strange transparent spot at the arctube of my 8000K 70W MH lamp

I've noticed recently that there is a transparent spot at the right down part of the arctube (Marked by the red arrow) of my 8000K 70W MH lamp.
What it is?

20190810_172632~2.jpg Screenshot_20211003-204423.jpg Screenshot_20240106_155554_Gallery.jpg Screenshot_20241004_184117_Gallery.jpg IMG_20151006_175903.jpg
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Filename:IMG_8109.JPG
Album name:dor123 / Lamps
Filesize:666 KiB
Date added:22 Apr, 2024
Dimensions:2048 x 1536 pixels
Displayed:966 times
URL:http://80.229.24.59:9232/gallery/displayimage.php?pid=20645
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dor123   [22 Apr, 2024 at 12:56 PM]
Picture of the spot when the lamp is cold:
AngryHorse   [22 Apr, 2024 at 02:15 PM]
At first I thought it was one of the bumps on the anodised reflector plate?, could be just an air bubble in the quartz though?
dor123   [22 Apr, 2024 at 02:27 PM]
This spot wasn't there, when the lamp was new.

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