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......I don't think it has been conclusively proven that the most expensive bulbs with the special names produce any better lighting than a plain jane H4 costing under $10.
Barron
My understanding, similar to Kent's above description, is that the "H4" is a specification for the size and shape of the bulb holder (metal frame) and also for the connector plug.
The 55/65 refers to the watts of power consumed by the bulb on low/high beam. 55/65 is standard.
Barron
Actually, standard is/has been 55/60, not 65. Normal higher wattages used throughout the years have been both 55/80 and 55/100. Without a wiring upgrade, 55/100 actually gives less light output than either the 55/60 or the 55/80.