Electrics light fittings?

I am changing 2 light fittings in the kitchen that both go to one switch. Light 1 is working - there are 4 wires - red, light and blue and black! No problem. The problem is with the Light 2 - there is a yellow, blue and 2 black wires, no red! I wired it up with the yellow and then the 2 blacks and 1 blue together but it does not work!!!!! Can anyone give me some advise?