We have slim ballasts and normal ballasts,which match the lamp types as follows H1, H3, H4, H4(hi-low), H4 (xenon+hologen), H7, H9, H11, H13,H13(hi/lo) 9004, 9004( hi-low), 9005, 9006, 9007, 9007 (hi-low), D2S, D2R ect.Simple to install, usually plug and play(you can get the power throw the Head light plug and you don't need to connected to the battery of the car.) .

 The ballast can auto-ignite and auto- protect the car lamp. And the ballast can keep the wattage of the bulb always 35w.

50% energy saving (Draws only 35 watts compared to 60 watts for halogen systems).

 300% brighter than the average equivalent 60-watt halogen lighting.

 1000% using life span (3000 hours compared to the 300 hours for halogen system).