So I'm creating a backpack system to carry around and shine a 100 watt HID lamp (using the arc tube for UVC mineral collecting.) This system currently includes a 12v lithium battery, a power inverter to 120vac, and a 120v ballast setup (including a 300vac cap) that drives the HID. The actual voltage output to the HID is 20-30vac.
With all these different voltages, I'm a bit confused about ground. Should I have some sort of common ground in this system, or should every part be isolated?
Again, all this will be sitting in a backpack while the light will be in hand. So also figuring out whether I should build a box containing these things out of aluminum or something non-conductive instead like wood.