At Envirobrite we keep ahead of the technologies by adopting them into our projects at an early stage, this gives us the upper hand. As these new technologies grow we have the ability to give the right advice through real experience.

Technology over the years in lighting has evolved quite rapidly. The first artificial electric light was demonstrated during 1802 in London, by Sir Humphry Davy at the Royal Institution of Great Britain. It was the carbon arc discharge lamp, and since then the electric discharge has been intensely researched and developed for one fundamental reason - that it creates light from electricity more efficiently than any other kind of artificial light source.

Over time it was learned that the discharge could be made to generate light more efficiently by arranging that it took place inside a rare gas instead of through the air. This led to the creation of gaseous discharge lamps which frequently make use of the noble gases helium, neon, argon, krypton or xenon. Carbon dioxide was also of considerable interest owing to its white light output.

During the later parts of the nineteenth and earliy twentieth centuries, developments in discharge lamps took a back seat whilst efforts were focussed on the development of an incandescent lamp. Although the arc was very efficient by comparison with other sources of its time, it was intensely bright and was only suited to outdoor illumination. Small oil and gas burners continued to hold court indoors and it was recognised that efforts should be made to "subdivide the electric light", such that it could be made in smaller packages which were suitable for the mass market of indoor lighting.

There were numerous contributors to this field, but the first men to achieve practical success with commercially viable lamps were Sir Joseph Swan in England, and Thomas Edison in America, who quite independently invented the carbon filament incandescent lamp in 1878. Numerous changes have taken place over the years in search of better filament materials yielding incresed efficacy and longer life. In addition developments in halogen chemistry have realised smaller and still more efficient lamps, and optical innovations have played an important role in efficiently creating beams of useable light.

In the 1930s attention returned to the discharge lamps, this time employing metallic vapours instead of the former gaseous fillings. Sodium and mercury were initially employed on account of their high vapour pressures and desirable emission in the visible spectrum. Since the 1960s their emission has been augmented by the introduction of other elements in the form of metal halide salts, and tremendous progress with luminescent materials has led to a whole family of fluorescent lighting.

In more recent years, a new category of solid-state light sources is emerging in the form of Light Emitting Diodes, which will have an equally profound effect on the lighting market. Their capability to generate coloured light with high efficacy is beginning to open up entirely new areas in lighting.