For those who want to know about H4
the design of the BJ Union H4 have a sheilding around it so it only lights up
the top part of your Headlight/Lamp. hence it will only product a low beam.
Not many HID out on the market have the correct shielding hence it will shine everywhere and all over the place.
The hole circled in red will open up in high beam mode only, during low beam
mode the hole will be close hence there will be no light going down to the
bottom parts of your head lamp.
The picture below shows the integra using HID, the same system as BJUnion, where the light is only reflected on the top half of the headlight/lamp.
After installing any HID is recommanded that you adjust the ligh level to be abit lower. As the standard one design for halogen is quite high.

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