All lamps are new. The same bulb, power supply and light tunnel were used for each test.

Marchal 7" round flat-face H4 high/low beam (Valeo 61241303, produced 1983)


Cibie 7" round Z-beam H4 high/low beam (Valeo 084982, produced 1985)


Cibie 7" round H4 high/low beam (Valeo 082440, current production 2005)