Electrical Questions? Ask an Electrician Online.
Welcome. My name is ***** ***** would be glad to assist.
The ground and neutral will both function as the common side of 120 volts.
The only difference, is using the ground for neutral can become a danger to anyone performing work on the fixture with the safety issues of doing so.
It definitely needs to be corrected, white goes to neutral in all cases, never to the ground.
Neutrals are also required to be insulated wires because they too carry the same current as the hot wire and can cause electrocution if you get between the 2 wires.
Once corrected on the neutral and ground, you can then troubleshoot accurately and measure between the hot and neutral at the bulb socket to insure power.
Let me know how it goes and anything needed,