Yes I did that. However here are some things you need consider
Most after market LED lights have the LED arrays on the either sides of the assembly, making the light patter look split between the middle, especially with the low beam. However it has only an esthetic drawback, the effectiveness is not hampered by it.
The lumens promised and delivered vary drastically based on the design of the reflectors, somehow I feel that the halogens have a higher intensity though the temperature is warmer.
The Civic has very limited space behind the head lamps so circulation will be an issue, so Active cooled LED head lamps will be your friend. Also, find someone has small hands. Ye O'l Mr.Bockwurst fingers will have mild coronary playing with this lady's headlight related plumbing.
Since these bad boys get really warm, it makes sense to buy one with controller that monitors the health of the cooling fan and cut power to the lights if the fan fails. ( we don't want those expensive headlight housings melting away)
Since the internal resistance in LED lights are pretty high, it might tell the ECU that the bulbs are burnt so then "CANBUS Ready" ones seem to work (at least for me, I didn't try it with one without this). I've heard that also causes the lights to flicker.
The micro controller for solving the above two problems is attached to the light assembly and it gets really hot, so had to use double sided thermal tape and fix it to the chassis.
However having said that, the up side is the headlight does not get warm (as LEDs are more efficient and the cooling fan is somehow managing the heat on the backside. (pun)
However the LED lights delivered as part of the TekPack is alot more impressive and looks cooler too.