1 pc bulbs

What is the bulb spec for the jdm 1 piece headlights? The headlights are brand new and they are not very bright. They are not oxidated and the bulbs are new. Also I cant get the bulbs to fit all the way in. What is the right bulb size. I ve tried h4 bulbs from like auto parts store but they dont fit in the groves.

http://www.g2ic.com/forums/showthread.php?s=&threadid=55072&highlight=JDM+headlight+bulbs

Please search next time.

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