How to make sense of this?

[SkiFreeYetiii]

Hello, I am trying to replace some lights in my walk in closet, I began with light 2 and before realizing how confusing this could get, I forgot to take a photo or label the 4 black wires. All other wiring is just as the electrician did it. My question is, how do I figure out how to wire my new light for light 2?

Here is are some things I know:

• Light 2 has all black wires (which leads to confusion)
• All 4 black wires in light 2 are hot (no neutral from what I can tell)
• All lights have brown romex, all switch boxes have white romex (not sure how this is possible)
• Light 1 turns on as is, light 3 does not, light 2 all 4 wires are capped individually currently
• I checked to see if I could complete a circuit with my multi-meter on black wires from light 1 to 2 and found there was no link

In the diagram, no ground is shown to make it less messy.

Thank you so much for the help, sorry about the weak diagram!

 

[littlespark]

There must be another box somewhere where all the romex join up. The browns and the whites.

Once you find that, you can work out where the 4 blacks at light 2 end up