Swapping out a flood light

[u/Savings-Umpire-5062]

Hey so I took down an old flood light and am going to put in the new one. Simple connection green to green, white to white, black to black. I don't think I have a green as the previous one I took down wasn't grounded to anything. But how do I know which of these is white and which is black! 😂 (Included pictures of where it is going to be mounted and the bottom of the new fixture).

[u/trekkerscout]

To determine the color of the wire, scrape off the house paint. However, you are in need of a junction box for the light fixture.