Help with 12 volt rocket igniter

Hi all,

I was looking into building a simple (but hopefully cool) model rocket
igniter. Yeah I'm bored, but stupid as a brick. About the only thing
I know about electricity is 110 volt hurts when you touch it. :)
Luckily this is only 12 volts. ;)

You can view the plans here: http://home.earthlink.net/~rbogerjr/index.html

If you scroll down and hit "contents directory" it will show you the
"how it works".

How does the lightbulb limit the current that is going through the
circuit without igniting the engine igniter? I am assuming from what
I have read is anything above 6 volts, ignites it like a fuse blowing.

I would love to build this unit, only I would like to change the
incandescent bulb to an LED in addition, add a piezo for an audible
sound as well. Where should the piezo be added in the diagram?

Can anyone shed some light for me on this? Thank you for any replies
and have a great night.

.

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