Crescent discusses fibre-optic lighting solutions

Crescent Lighting discusses the benefits of using fibre-optic lighting, the components required, choosing a projector and the dos and don'ts of the process.

The first benefit of using fibre-optic lighting is safety; the light projector is the only part of the system requiring power.

Fibre-optic cables are inherently safe, according to the company.

Second, filters combined with the fibre eliminate virtually all infrared and ultraviolet radiation.

Another benefit is maintenance and access; one accessible projector can power a number of remotely mounted spotlights.

Fibre-optic techniques can be used where standard lighting solutions would not be possible or appropriate.

These fibre-optic solutions can reduce energy consumption in most situations.

Fibre-optic lighting can produce decorative and functional lighting effects not possible with any other technique.

The components for a typical system are: a light projector with a light-emitting-diode (LED), tungsten-halogen or metal-halide lamp and a reflector system to focus light into the fibre; an end-emitting optical cable (loose-packaged polymer or glass strands inside a protective sheath) and a side-emitting optical cable (cabled polymer strands in a clear sheath or cracked glass strands); luminaires (lensed or unlensed heads, fixed or adjustable); and accessories such as tracks, adhesives and cable clips.

Usually, the choice of projector for a fibre-optic project will be determined by the light output required, taking into account the light contrast in the area.

The size of projector and the available space will also be an important factor, according to Crescent.

A functional test on site or in a similar environment is recommended to make an informed decision.

The latest developments in LED technology mean that this is now a light source that is being used in projectors.

The outputs are still lower than the best tungsten-halogen units, but their small size, almost silent running and colour control possibilities make them a useful additional choice for decorative projects.

Typical applications include museums, water features, signs, bars and nightclubs, architectural decoration, retail displays, cinemas, hazardous areas, star ceilings, glass block walls, patios and decks, emergency lighting, display cabinets, fountains, pools, Jacuzzi architectural decorations, reception areas, wet rooms and spars, restaurants, decorative features, star cloths, pathways and bridge lighting.

Fibre-optic lighting is a versatile technique that can be applied to a variety of projects and will meet the demands of a number of situations.

It does have limitations, however, and must be approached with care and the support of an experienced supplier, according to the company.

Customers must ask for a demonstration of the equipment proposed, ideally in the area that it will be used or a test area with similar lighting contrast conditions.

They should try different projector types and fibre cable sizes, making sure that projectors are housed in areas large enough to provide enough free air for cooling and that they are accessible for maintenance.

Customers should also measure for optical cable lengths on site, rather than taking dimensions from a plan.

They should allow for a 'spare' optical cable at the projector.

They should not, however, expect fibre-optic lighting to work effectively in bright background lighting conditions.

Customers should not work with a manufacturer who cannot demonstrate sufficient experience with the technique or specify long optical cable lengths (10m or more) without a demonstration at that length.

They should not allow optical cables to be positioned where they could be damaged or walked on, for instance.

Lastly, customers must not bare the port end of the optical cable with their fingers; the grease will reduce the performance.

Instead, it should be cleaned with the recommended fluid.

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