bulbs

So few days ago I decided to go for a LED headlights instead of the stock h11 halogen bulbs. I bought h11 LED bulbs (no kit) and thought plug and play works. I think I need a converter or some box sort addition. Does anyone know what exactly i need? I hear its AC-> DC, rectifier, ballast...

Some of you may have noticed some parts lists show a H9 for the high and a H11 for the low. And in Canada and the USA we get H11's for both. H9's are legal and came stock in some cars. Now I suppose you could use a H9 for the low beam as well but it might be too bright and I think they generally...

Has anyone replaced the stock bulbs? If so which did you use. Seems like LED bulbs would be a good match for the LED taillight.

Has anyone changed the stock ones yet? Seems like they would look nice along side the led taillight.