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30pcs 12VDC Bulb Circuit Help

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buggstar

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Hi Guys,
I need help to come up with a simple DC circuit:
1. Powered up by an AC Adapter
2. Connect 30pcs 12VDC bulbs

The 12VDC bulb is small (about 1cm length) I bought from a local electronics shop.
For reasons I can't explain, the bulbs have no polarity, but during the demo, it was powered up by a 9VDC battery!

I've searched around (for LED circuits) and found out that I can do it in a serial/parallel connection.

I'm not too sure on the resistors needed and the proper way to link them up in a circuit...

Thanks guys.
 

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