Read the statement by Michael Teeuw here.
What Lighttransmission-Rate have your Mirrors?
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i recently got two offerings from local glazier in vienna:
For a 120x70cm Mirror (light transmission 10-15%)
6mm for 380€
3mm for 286€light transmission 7:1
SGG SPYGLASS for 192€has anyone experiences with such transmission rates? i would like to use the mirror in my bathroom.
kind regards
Christoph - 
https://www.myspiegel.de/spionspiegel-pg-2102.html
Offers a 8mm 120x70cm with a Transmission Rate of 1:5 for 183€
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@cpramhofer
Do you have experiences with this vendor? The price sounds rather fair, but they mention a light brown accent due to the reflection material. I’m curious how this looks like. - 
I got a whole mirror-test-set from glastroesch.
1%, 12%, 20%, 30% & 40%.
So i had the chance to do some test. The results:- 
12% when you use the mirror in a dark room & don’t want to see the casing
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20% when you have a window or something like this next to the mirror
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1%, 30%, 40% are not usable (1% you can’t see anything, 30&40% you see the bleeding of the backlight)
 
If you wanna know more, don’t hesitate to contact me :-)
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@Patrick
Do you actually see the golden shine glastroech mentions on their website for 12% mirror glass? - 
@yawns
Depends on the definition of “see”
I mean, it looks like a normal mirror to me but ofc you can see a little golden “glance”.
In my opinion it’s acceptable quality… 
