The dragonfish produces a red light beam using a unique organ located near the rear of its eye and it is one of the few deep sea creatures that can perceive red light. Although red light does not ...

If you only see a green or red light, it indicates an aircraft going ... Searchlights project a bright beam to illuminate the ground below, similar to how different bright flashlights work ...

There’s also a red light, which can be used on constant beam or activated to pump out a pre-programmed continuous S.O.S. sequence of short and long bursts. It’s possible to lock the light ...