Swapping a hallway light fixture attached to 2 3-way switches, (each end of the hallway). When I dropped the fixture from the ceiling, the box has 2 black wires that are wire nutted, 2 red wires that are wire nutted, and 2 white wires connected to the single bulb fixture, and 2 grounds twisted together. The new fixture is 2 bulbs with each bulb having 1 black and 1 white wire, one bulb has the ground. How do I wire the new fixture please? [current wire configuration in box]
If you have not undone the wires to the old fixture yet, place black tape/paint/marker on the white wire connected to the old light's black wire.
The new lights black wires will be connected to the white(power) wire with black marking.
The other two whites from the new light connected to the other white(neutral) wire.
If you have already disconnected the wires from the old light, you should use a multi-meter to find which white wire is the power one.
This is done by finding which white wire reads ~120 volts to the ground wires. The neutral(other white) should read 0 volts to ground.