9003/h4
#1
9003/h4
What is the real difference? I mean I know(NOW) that they are the same bulb type. But they have different names so there must be some differnce. Are H4's normally an aftermarket wattage? Are H4's like a metric size of lightbulbs?
#3
Re: 9003/h4
Originally posted by SLC I30t
What is the real difference? I mean I know(NOW) that they are the same bulb type. But they have different names so there must be some differnce. Are H4's normally an aftermarket wattage? Are H4's like a metric size of lightbulbs?
What is the real difference? I mean I know(NOW) that they are the same bulb type. But they have different names so there must be some differnce. Are H4's normally an aftermarket wattage? Are H4's like a metric size of lightbulbs?
The ANSI #9003 is a DOT designation for the bulb that an HB2 housing uses
H4 is an SAE/ECE term for that bulb.
I wouldn't worry about the nomenclature...just remember that it is the best dual-filament bulb on the market. An overwattage bulb (not 55/65), whether refered to as 9003 or H4 is not DOT or ECE approved for use on road. Also, I would not use an overwattage bulb without using a special harness with beefier connectors, wiring and higher amperage relays.
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