1. Such as D1S/D1R/D1C:
N - the headlight type
S is for "Shielded";R is for "Reflector",C is for "Colored".
1)Singular with starter(starting device),even numbers have no.
2)Mercury bulbs(D1S,D1R,D1C,D2S,D2R,D2C)run at 85v AC,they can use same HID Ballasts;
Mercury Free(D3S,D3R,D3C,D4S,D4R)xenon bulbs runs at 42V AC,they also can use the same HID Ballasts.
3.Each D series Xenon Bulbs notches different.
4.D3S is the modified and environmental model of D1S.But D1S brighter than D3S,alo color temperture better(same power & color temperature comparision).
So though D1S an D3S,D2S adn D4S xenon bulbs both looks like similar in appearance,the can not be used in common.
Contact: Cindy Huang
Company: Zhuhai Future Energy Technology Co.Ltd
Add: Fushan Industrial Park,Doumen District Zhuhai.GD.China