receessed 3inch light utilitech light emitting diode

[bikeone]

In the power box attached
To the lamp housing there are three wires a black ,white and a green with a black piece with what looks like copper wire wound around in side its hooked to the the electrical box for the Ilight is this a res, wire or a ground wire these are light emitting diodes light

 

[The Cobbler]

?

 

[bikeone]

can some one tell me what this is

 

[The Cobbler]

looks like a choke or RF noise filter

 

[bikeone]

can some one tell me what this is

That's why it's on the ground eire