I have been told H4 headlamps were not/ are not legal in USA but they are commonplace in U.K. and other countries — this recent test

https://www.autoexpress.co.uk/produc...bulbs-2022?amp

by Autoexpress magazine in U.K. might be of interest to folks looking for bulbs on countries where legal. It seems these have undergone an objective test to refresh their bulb test of a few years ago.

No allegiance

Steve