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?

DSC00654.JPG DSC00149.JPG IMG_8109.JPG IMG_8109.JPG IMG_8109.JPG
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Filename:IMG_8109.JPG
Album name:dor123 / Lamps
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Date added:22 Apr, 2024
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dor123   [22 Apr, 2024 at 01:56 PM]
Picture of the spot when the lamp is cold:
AngryHorse   [22 Apr, 2024 at 03:15 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 03:27 PM]
This spot wasn't there, when the lamp was new.

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