I want to install a new light fixture in my kitchen so that it matches a light fixture that's already there (kitchen has 2 light fixtures on ceiling). My brother said it's easy and he would do it even though he's never replaced a light before and knows nothing about electrical wiring. We thought it would be just connecting white to white and black to black. But today when I examined the other fixture that's already installed to see how the wires are connected I saw there are 3 plastic connectors, one looks like it has 3 black wires twisted into it, the other looks like it has white wires in it (can't tell how many), and the third has me dumbfounded, it looks like there is a white wire and a red wire twisted into it. The light fixture has 2 wires, one white and the other white with black stripes. I was expecting the striped wire to be connected to the red but I'm pretty sure it's the fixture's white wire. I can't see where the striped wire is connected. The new fixture has one white wire and one black wire plus a bare copper ground wire, and now, with the exception of the ground wire we're not sure to what they are suppose to be connected? Also, the new light fixture looks like it has aluminum wires and I'm pretty sure the wires in the ceiling are copper, does that matter?