Theseinclude H7, H11, HB3, HB4 H1, H3, H4. This group contains headlight bulbs and takes in fog light bulbs. But of course, the sockets for the bulbs are different. Onthe left is an OEM H4 halogen bulb and on the right is a HogWorkz H4 LED Headlight Bulb upgrade. Photo by Joe Zito. Best motorcycle headlight upgrade options. They can produce about three times the amount of light as a halogen bulb using the same or less power. I personally recall going from halogen to HID headlamps for Iopted for the X-Treme bulbs as an option cheaper than replacing the whole housing and bulb to H4 (at this point). driving lights, windshield-level lights and a roof-level light bar all at the same time. Haven't had the opportunity to use most of it, but its all there neatly tucked-away for that day in the future. I'm a JKO Reject. Save Share. 9003and H4 bulbs look quite similar on the outside, and in some forums, you'll read that they are the same, while on others that they are different. So, Atthe same time, all kinds of modifications are illegal, including engine swaps, and that hasn't stopped people from putting Chevy LSs into everything. HB2/H4/9003, HB3/9005, HB4/9006, HB3 ByGraeme Taylor. Updated December 7, 2021. In this article, we’ll be outlining the main differences between 9003 and H4 headlight bulbs. Many people . #3. My Lexus LS400 has H4, when high beam is on low beam is off. The reason high beam is much brighter than low beam with only 5W extra because the high beam filament is much hotter and its life is much shorter, but high beam is rarely on so the low beam filament is usually burnt out before high beam. CarBulb Designations. The bulbs on your vehicle will be designated with a name or number. For example, your headlight bulbs might be H7 or H4 and your indicators might be 382 or 581. The suitability of a bulb will often be decided by the team that designed your vehicle. They might choose that your vehicle uses H7 dipped beam bulbs and H15 main hWIF.