I get the feeling you're in over your head.
In your situation I'd find ways to independently confirm what the people at work tell you. People may observe things correctly but drawing correct conclusions about 'why?' is more difficult and sometimes they come up with the most outlandish ideas.
This confirmation process also helps when troubleshooting so that you don't go very far off on the wrong path.
Here's a thought experiment for you.
There is a wire coming out of a box in a very old house wall. It is insulated but the color has been painted over.
How to tell if it goes to a neutral, a ground, a hot lead or one side of some kind of load?
How to tell if the connections back to the panel have integrity?
What test instruments do you need? Why these in particular?
Another question:
What is more likely to correctly predict LED brightness, LED current or LED voltage? How do you know? What is your reasoning?
BTW, some people you work with may be there because they have merit and others may be 'political appointees' in the broadest sense.
Avoid the second group if you can identify them - they are probably incompetent and almost certainly proud, both at the same time, and they can get you fired for cause or without cause.
And if there is ever a circuit problem and someone says "It's a ground loop" ask them for a diagram showing where the current goes. Expect a lot of hand waving at this point.