I am wiring a simple one bulb fixture in a closet. The old fixture had a 3-prong outlet plug as well as a bulb and the new fixture only has the bulb. There are two black and two neutral wires (for a total of 4 wires coming from ceiling) but only two screws on the new fixture. Can I combine the two black to one screw and two neutral to the other or will that supply too much power to the 60 W bulb?