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Originally Posted by agentsmith  Can anybody explain H1, H2, H3 .. H7 "ratings"? What do they indicate?
Agent Smith. |
They are not ratings, they are specifications.
H4 is the standard halogen with low high beam in one bulb.
Then you have a different specification for fog lamp halogens.
They concern the shape and design of the halogen bulbs and are not "ratings".