51.   Sun compasses, which use polarized light as a direction finder, are not unknown in the natural world.

52.   Test a series of surface samples using ultraviolet light, magnification, radioactivity detectors.

53.   The device uses infrared light to read the unique patterns in the iris of an eye.

54.   The large, sparsely furnished room is bathed in warm golden floodlighting, which embodies uplift to Iasiello, who likes to meditate using colored lights.

55.   The process of using the lights to transmit data starts with a ballast, the component of fluorescent tubes that controls the current needed to create the light.

56.   The oven uses halogen lights to cook almost as fast as a microwave, while also grilling and browning meat.

57.   The Postal Service will increase security at its facilities and introduce equipment that uses ultraviolet light to sanitize mail at selected locations, Postmaster General John Potter said.

58.   The searchers scramble in darkness, not daring to use flash lights that would make them targets.

59.   The transmitter sends a signal to the headset using infrared light like a remote control.

60.   The system is unusual in that it does not use infrared light to track where the driver is looking.