simple really competition lets be honest these bulbs cost pennies to make osrams when they werent popular were a lot cheaper than they are now.all i can say is they last and have as good a light as l.e.d sidelights no yellow to them at all.
look at pia lights extortionately priced yet when tested cheap chinese bulbs were better that says it all
Arthur how does the combined high/low beam H4 work out? Only know about H1 and H7





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