Why tf do you need a relay to drive an LED?
A transistor is more than enough
Raspberry Pi driving a 5v relay using a transistor. #electronics https://cdn.satellite.earth/1ea2a5cd213b90a5a7af622a3545994c55c6db71c000526f3714e484bea764eb.mp4 
Discussion
The LED could be replaced with anything. Use your imagination. Here it is being used to show the relay's state.
For indication of current if I'm not mistaken
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