I have a light fitting of precision of 3 bulbs in a room to sleep. I want to replace it by a fitting of simple precision of bulb. I have new rose etc., but... it seem y to have 4 sets of wire leaving the ceiling, and I think that all has red wire, black and of green/yellow (its a little difficult to be very sure that it seems y to have to join additional by using a connector). I looked at another suitable light who have only 3 sets of wire of in top. If there were only of 3 with that which I want to change am sure that I could manage to change it, by copying the other. But what 4th is all approximately? Thank you.