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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?

IMG-20240807-WA0004.jpg IMG_9391.JPG IMG_9443.JPG IMG_9542.JPG IMG_9685.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:387 times
URL:http://80.229.24.59:9232/gallery/displayimage.php?pid=20645
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dor123   [22 Apr, 2024 at 11:56 AM]
Picture of the spot when the lamp is cold:
AngryHorse   [22 Apr, 2024 at 01:15 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 01:27 PM]
This spot wasn't there, when the lamp was new.

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