Connecting Cord to the WAGO 873-902 Connector

I recently received my order for the LED-Ready T8 Tube Light Fixture - Strip Fixture with Reflector PN 4502 with a WAGO 873-902 connector. 

There are wires in the fixture with black and white insulation going into one side of the connector. I can tell which wire goes to the wider of the 2 extension cord plugs. 

Does that wire correspond with the white or black insulated wire in your fixture? - and does it matter which wire I connect to which input port on the WAGO 873-902 connector? Why is the underside of the reflector light blue? Does that help with color correction?

We can confirm that the white wire in the fixture corresponds to "neutral" while the black wire corresponds to "hot" (positive/live).

Additionally, the blue film on the fixture is for protection during transit; please remove the film before use.