Go to Auto Express's site, Product review of bulbs, not lights.

Don't let a garage align them, they are not accurate enough.

Find a long desserted road, cover one lamp at a time and adjust to suit.

There are legal requirements for setting a vehicles dipped beam. Using a long desserted road may provide the driver with the best light but it's more likely to cause other drivers to be blinded by incorrectly set dipped beams.

My garage is able to set up the dipped beams correctly and I can tell the difference if a beam isn't set properly either too low or too high, however, setting the main beam to the legal requirements needs the right type of equipment which I don't have. When fitting a new set of dipped bulbs of a different type to the existing bulbs the beam may be ok but I want to make sure they don't dazzle other drivers.