void main(void)
{
    var lights = GetByType("interior_light");

    foreach (lights as light)
    {
        var enabled = false;

        // Save the original settings so we can reset to them later
        var color = light.getColor();
        var radius = light.getRadius();

        if (!enabled) // Starting from the Off state, we switch on Red Alert
        {
            // Set them all to red
            light.setColor(255, 0, 0);

            // Brighten and dim repeatedly
            while (true)
            {
                light.setRadius(4);
                sleep(1);
                light.setRadius(1);
                sleep(1);
            }

            // Save On state
            enabled = true;
        }
        else // If it was already on, set it back to defaults
        {
            light.setColor(color);
            light.setRadius(radius);
            enabled = false;
        }
    }
}