[loc]

See e.g. these threads for some discussion:

Mistake not adding xenons!
http://www.a5oc.com/forums/showthread.php/mistake-not-adding-3657/index.html?t=3657

LED Lights installment after order
http://www.a5oc.com/forums/showthread.php/led-lights-installment-2329/index.html

1.8 TFSI without LED and XENON in the fronT, help!
http://www.a5oc.com/forums/showthread.php/1-8-tfsi-3342/index.html

 

[loc]

Oh and do note you need to change the regular halogen light fixture to a Xenon one plus all the transformators etc. You can not install LED DRLs without Xenons.

In fact the halogen lights too have DRLs, but they are just two regular bulbs in each side much like on Audi TT.