[SpudRider]

Originally Posted by oldqwerty

Anyone know what kind of bulb is stock?

Originally Posted by G19Tony

I spoke to Steve earlier. He said it was an H4. I went out and bought a PIAA H4 that I will attempt to install this afternoon.

Perhaps CSC specified an H4 bulb, but the stock headlight bulb in the Zongshen RX3 is an HS1 bulb. HS1 bulbs are rated at 35W/35 for a standard bulb. Since the headlight output of the RX3 is fairly poor, I assume my RX3 has the 35W/35 HS1 bulb.

The H4 and HS1 bulbs have the same connector configuration. However, one of the connectors is a different thickness. Therefore, you can substitute an H4 bulb for an HS1 bulb, but not the other way around.

http://en.wikipedia.org/wiki/User:KDS4444/HS1_bulb

I plan to install an H4 bulb in my RX3 headlight, since the H4 bulbs have more power, and the RX3 alternator generates enough electricity to support the brighter H4 bulb.