| For any of you who always wanted to know how to recognise a type of LPS bulb there is a simple way: Just look at the colour of the base. I believe that is one of the ways I think
-SOX (regular): Brown -SOX plus: Red -SOX-E (efficient): Black -PSG SOX: blue & Green
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Member from England, but has the whole family from Poland, that's bad luck I guess...
I Photograph Polish streetlights and sometimes buy some from OLX for collection.
Biggest Polish streetlight manufactures were Elgo Gostynin and Mesko Lighting. Elgo however closed down in 2016...