lude000

I've been looking into getting some jdm headlights and in the process i've gotten myself confused? I always thought that these headlights used H1 and H4 bulbs. Now I just read something about H4H bulbs (which i've never heard of) and that they are the ones that fit, not just regular H4's. Can anybody tell me if you can just use regular H4's in these lights? Also, if you can use regular H4's, are any modifications needed to use H4 HID's?

Thanks.

cleanLude

I use regular(stock) H4 bulbs in mine....even got my bulbs from my frends stock civic...works fine...i use PIAA H4's too...no fitments problems at all...not sure about the H4H thing myself, but as far as HID goes, depends on the kit...if they are retrofitted or wutever.

willmbrk

The only difference between JDM H4s and USDM H4s is in the harness. USDM H4 harnesses have 3 wires; whereas the JDM harness has two wires. USDM harnesses have an extra wire for a relay. I ran into this problem when I tried to upgrade my headlight harness.

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vile10

I don't think H4 and H4H is the same bulb size

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BoostedH24

what i did was when to a salavge yard and cut the harness off of a civic and wired it to the preludes wires and ran the high beam to the H1 bulb then i put piaas in then HIDs which i still have

and i think that H4H is a typo never heard of H4H

RedH22A1

H4H is not a typo...Look it up on ebay...Raybrig carries them. I heard people use them in Japan for proper beam pattern.

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cleanLude

After some research, this is what i have found...H4H bulbs are used for JDM Civic and Integra headlight bulbs that dont use a regular H4...it just hit me now too cuz i used to have a 92 Integra with one pieces but couldnt find any H4 bulbs that would fit...so thats why they have the H4H...heres a side by side comparison..



I believe its only a matter of difference in the bases that will allow the light beam to shine properly in those specific headlights...for JDM preludes headlights tho, you need NOT worry about that....from looking at the pic, it looks like the H4H bulb will even stick out too far...Hope this helps a bit.

willmbrk

Oh yeah, my buddy had the same problem with his 93 Teg. I totally forgot about that difference.

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lude000

alright, cool thanks for your input guys

RedH22A1

Bringing it back from the dead... Has anyone tried using H4H bulb in their JDM headlights ?

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cleanLude

It would prolly go straight thru, cuz theres no base to mount the bulbs down to the headlight housing...