Only for iOS devices with the LED flash!
Use your iPhone 4 as a torch or an emergency SOS beacon. The camera flash LED provides a bright light (or beacon).
Simply select the area of the lighthouse for the function you require. The lighthouse's light will reflect the current state of the camera LED. Select again to switch off.
For fun, there is also a strobe function - use the slider to select the frequency required.
***ios4 required***