Youshould use a real H4 bulb in an H4 reflector. No LED or HID conversion works the same, because the light source is shaped differently from the H4 filament. IMHO the best headlight conversion, bar none, is the Cibie H4 E-code reflector and 80/100w H4 bulbs, in a relay wiring harness that runs the bulbs straight from the battery. The9003 vs H4 bulbs are two very different models that serve different purposes. The 9003 is meant for use on the road, while the H4 is better suited for off-road vehicles. Additionally, the H4 has a different base than the 9003, so it cannot be placed into a 9003 socket. Brent Ordway is an ASE-certified car technician. Ithas only 1 filament, but has something like a reflector built into the bulb which moves when you shift the stalk in the car and thus changes the focus from High Beam to Low Beam. No, S600BENZ, you are wrong there. In the H4 bulb, as akshay1234 has mentioned, there are two filaments : one for the high-beam, and the other for the low-beam. Yellow 3000 Kelvin, Akin to halogens, soft yellow light. Off-White: 4300 Kelvin, White, and Yellow combination. Pure White: 5000 Kelvin, Sunlight-colored. Crystal White: 6000 Kelvin, Blue-tinted white color. It’s important to make your bulb choice based on what color is best for you, and the higher Kelvin in your bulb the more blue the bulb 【 Plug and Play】ROYLUX h4 headlight bulbs are the same all in one wireless design as the halogen, driver and fan all in one unit, real plug and play, just direct replacement of factory halogen Xenon bulbs H4, can be easily installed to your vehicle within 5 minutes without any modification. 6000K White All-in-one H4 Bulb, Fanless Xenonheadlights produce a bright light with a colour temperature between 4,000 – 6,000K. You can often distinguish headlights by looking at the beam pattern they produce. For example, if you turn your headlights on and they quickly beam yellow holding the same intensity, they are likely to be using halogen bulbs. H11and 7 lamps will generally be better than H4 as the lens is designed for the one job (dipped or main), whereas an H4 bulb has both dipped and main in the one bulb so the lens is comprised to do both duties. They are all 55w for dipped halogen so power is the same. Performance may be different if one is say a 150% bulb and the H4Hi/Lo LED Headlight Bulbs, Extremely Bright 10000LM/Pair 50W/Pair 6500K Cool White, High Beam/Low Beam, Halogen Head light Replacement, HB2/9003 Car LED Headlights Conversion Kits, Headlight Bulbs - Amazon Canada. Anything can happen in Formula 1 and usually does! - Murray Walker. Asa result, an alternative bulb called the HB2 or 9003 was developed. This can be rather confusing for consumers. The H4, HB2, and 9003 are essentially all the same bulb and can be used interchangeably. Many bulbs that fit this specification will feature all three labels on the packaging. Halogen v LED. H4 bulbs are available in both halogen qB2480Y.

are all h4 bulbs the same