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My Eurolux 8W UVA lamps, glowing exactly at mercury colour I think the lamps in my bug zapper glow slightly violetish blue colour when they were new. Why this is happening?

My Eurolux 8W UVA lamps, glowing exactly at mercury colour

I think the lamps in my bug zapper glow slightly violetish blue colour when they were new.
Why this is happening?

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Filename:IMG_8151.JPG
Album name:dor123 / Lighting fixtures
Filesize:1592 KiB
Date added:02 May, 2024
Dimensions:2048 x 1536 pixels
Displayed:229 times
URL:http://80.229.24.59:9232/gallery/displayimage.php?pid=20733
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Oliver   [02 May, 2024 at 12:39 PM]
Insect killer tubes phosphor often darkens over time which could cause the slight colour shift. They are usually advised to be replaced regularly (such as every 12 months) to ensure the bug zapper is always producing the correct amount of light.
dor123   [02 May, 2024 at 12:40 PM]
I don't see any blackening at the phosphor of the lamps. It is still white.
Here is a picture of the lamps when they are off:

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