Difference Between H4 and 9003 Bulbs. On the outside, there is absolutely no difference between H4 and 9003. Both share the same housing, the same dual-filament internals, and the same three-pronged connection. So, of course, they are interchangeable, i.e., installing a 9003 bulb in a vehicle equipped with H4s, and vice-versa.There are better H4 conversions. The best are Cibie and Koito; both can be sourced from Daniel Stern Lighting. Daniel Stern Lighting Consultancy and Supply The best regular wattage H4 bulb is the Phillips: *** NEW** Philips Xtreme Vision (XTV) 9003 XTP / H4 / HB2 60/55W Lamp High power is the Osram: Osram Rallye 70/65w +50 H4 bulb Most importantly, vehicle owners can use many LED headlight bulbs to replace halogen headlights if they want brighter, longer-lasting light. including popular 9006 and 9007 lamps as well as H4 Subscribe to Eric DIY:
If you touch the glass on the bulb, remember to clean it with something like acetone to get rid of the oil/fingerprint. Don't use kero, as it leaves a residual film. Changing the bulbs 1. Pull the bulb socket off. 2. Pull the rubber boot off. 3. Unclip the wire retainer, which work like a safety pin.
Pull the panel out ward away from the vehicle to detach the tabs. Now remove the three bolts from the headlight housing. Two bolts are located on the top of the headlight and one is on the side. With a towel placed on the lower bumper to avoid scratches, lift upwards on the two arms at the top of the headlight where the bolts were removed. Now
When it comes to bulbs, lifespan is measured in lighting hours. Standard replacement halogen bulbs can last as little as 180 hours while higher quality halogen bulbs can go up to 500 hours or so. Premium LED or HID bulb upgrades such as ours can last well over 10,000 hours. Another consideration is the beam in which the bulb is used.
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