The light fitting I bought has 1x Red Wire (A) 1x Green Wire (E) and 1x Blue Wire (N)...
The green wire is just a ground wire, black is usually the hot wire, that would leave the blue wire as the neutral wire. The white wire in house wiring is the neutral. The two red and one black from your wall is not standard in the USA, but it may be 220 volts. What kind of light fixture are you replacing, is it on a ceiling fan?
In the uk red was live and black was neutral, is this part of multiple wall lights ? then it should be only one red is live, the other may go to another light fitting. The light fitting would possibly be red=live, blue=neutral and green is earth, I say possibly because it is a mix of old colours and new. There should be installation instructions with it. Start by connecting one red to the light fitting red and the black to the blue connect the earth, make the other red safe and switch on. If that doesn't work change the wall red to the other and try again. If everything is working and no other lights are not working then make good and leave as is, otherwise you may need to connect all reds together for the other light to work. You may be able to identify the live red if it is a single with grey insulation cable.
