Flashing lights - best practice?

Hey everyone!

I've been working on a remote controlled fire truck (picture attached) and now I'm adding light and sound. I'd love the light bar to flash as realistically as possible.

I've tried two scripted "bulbs" that alternate flash every 2 seconds, but I can't imagine its very efficient for the simulator.

What's an efficient and semi-realistic way of achieving this?

Any advice appreciated!

Tsuki

How about using a prim rotation script in a cube that has alternate faces set Full Bright? As the cube turned, you would see a bright face, then a dull face, then a bright face .... Not exactly a "flash," but it might work.