Yes, all in 1. H4 bulbs are 2 filament. 1 for main beam, the other for dip beam.
Look carefully at the bulb, you will see shields for the dip beam filament. This directs the light onto the reflector in the correct place to achieve a light beam in focus.
HID conversions just give out a whole lot of unfocused light. They dont work with the factory headlight reflector and lens. Ive never seen a kit that works. They may give out more light, but its not focused into the area you want it to be. They are also blinding to other drivers because of it.