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Bright flashing light for fake alarm box?

Hi

I bought a fake/empty alarm box for my house, but thought I'd make it
look more realistic by putting some kind of periodic flashing bulb in
the unit.

I made up an astable on stripboard with uneven RC sides, so the thing
flashes very briefly every 1-2 seconds. This works fine, but I used an
LED, which isn't bright enough to be seen through the blue transparent
panel of the alarm box, from any distance at all.

The cct is driven by a 9v battery. Can anybody suggest something I can
use for a bright periodic flash?

Cheers,
Mark
 
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