In traditional halogen H4 bulbs the low beam filament (the one with the reflector/shield) point in a 180 degree field and the high beam has no shield and has a full 360 degree coverage. This is how all H4 light assemblies are designed to use.
Why then are there no H4 LED bulbs which use this layout? They all have terrible design or are only designed for low beams.
Actually that's not being fair, Phillips have a product that does this, but they are quite pricey. 400AUD pricey.