I think some are also fitted backwards, which results in a different colour appearance from the outside. Looks really sloppy, a bit like fitting multiple colour temperatures in the lighting.
The 222s also suffer from this issue as well - there are some of the smaller box style lights (just below/on the overhead racks) that have had different color temperatures - some have been warm white and some cool white. (Having said that, the 360 I was on yesterday also had two different color temperatures!).
The 222s also have halogen spotlights as the main lights for the walkways - why not fluorescent or (preferably) LED?
I noted that sitting beside the darker tint windows, mobile phone reception is much better, so either the replacement glass is an inferior quality or a different brand. The standard glass 'as supplied' seems to have a mettalic tint applied to reflect sunlight , but also blocks most radio signals. IIRC some Voyagers were fitted with mobile phone repeaters internally to overcome this issue. Not sure how successful that was.
Interesting. I can only assume that, as you say, the replacement glass has no reflective coating. Either that, or they might be fitted backwards (as another poster commented)? But would fitting the windows backwards still block RF - unless the RF shielding is designed to be one way?
I did hear of Voyagers having repeaters, but not supporting all networks. Mobile repeaters are a bit complicated because, not only would you have to make sure that all UK networks are compatible, but also all of the frequency bands too (which differ between operators).
It would be easier and more straightforward to just replace all of the glass in the 22x stock, with non reflective glass. Besides, the 22x series should have on board air conditioning to deal ith excessive temperatures?