They are normally H7 for reflector type lights.
D1S is a gas discharge lamp (commonly and incorrectly called a Xenon)
H11 is a plastic based bulb, that is sealed from the back requiring no weather seal. These are often used in fog lamps where access is from the wheel arch.
It is possible to have H11 bulbs fitted where the lamp is often fitted with a projector lense.
If you have H11 bulbs, then you could fit an H9 by trimming the base. The H9 has a 65 Watt filament whereas the H11 has a 52 Watt filament. The H9 is about 50% brighter than a standard H11.
If you are unsure about what type of bulb is fitted, then remove one first to check the type.