LED Headlights

Just wondering if anyone has converted the standard 7" headlights to LED? I'm looking to swap out my standard 7" headlights on my 69 GTS to LED units. If so was is plug & play?
Are any relays needed?

Thanks for your help!
Stu.
What you REALLY need to do is to upgrade the system. You'd probably be happy with good old silverline headlights after the system upgrade. headlight relays