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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_8101.JPG IMG_8108.JPG IMG_8109.JPG IMG_8119.JPG IMG_8120.JPG
File information
Filename:IMG_8109.JPG
Album name:dor123 / Lamps
Filesize:666 KiB
Date added:22 Apr, 2024
Dimensions:2048 x 1536 pixels
Displayed:10 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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