Question: is hb2 same as h4?
Answer: 9003 and HB2 are different names for the same bulb, so these numbers apply to just two kinds of bulb: H4 and 9003/HB2. ... Motorcycles in the USA have never been required to use sealed beam headlamps, and so the H4 bulb became popular for motorcycles in the US and worldwide. It is widely used to this day.