Fiber optics technology enables a light source to appear to be lit without being connected to electricity.

Optical fibers are flexible fibers made of glass, through which the light travels. The principle on which optical fibers is based is that of reflection and refraction. Light entering a hollow glass tube will be reflected back and forth by the inner walls of the tube, until it emerges at the other end.

Depending on the design of the fiber, by changing the angle at which the light hits the walls of the tube, some of the light can also be transmitted and refracted out of the wall, making the entire fiber glow.

 

Optical fibers can be used as single fibers or in bunches . Optical fibers which reflect the light internally so that it emerges only at the end of the fiber, are used to create star curtain , or  to light places where a regular instrument cannot be installed.

The other type of optical fiber, which transmits light throughout the fiber, making the entire fiber glow, is used to highlight lines in the scenery or for prop effects such as glowing words.

The strength of the light in an optical fiber will depend on the length of the fiber. Therefore, the light source must be chosen in conjunction with the length of the fiber. In any case, the length of an optical fiber is limited to 60 meters . In theatre, small tungsten-halogen units, such as 250W MRs, are usually used as a light source. A lens is installed in the instrument, converging all of the rays to the opening of the fiber. When colored light or twinkling are called for, a motor rotated disc or color filter can be installed between the light source and the lens. When optical fibers are sewn onto a black drop and terminated at a light source gelled with different color filters or a rotating textured glass disc, a magnificent twinkling star effect will be created.