Cold Light Sources

Fibre Optic Light Sources for the Gemmologist

Krüss offers three models of fibre optic light sources, all producing an even cold light.

Model KL5110 is designated as a ‘mini’ fibre optic light source unit. Supplied without a light pipe, selection is dependent upon user choice and requirements. These are available as single arm, two arms, with various extensions.

Model KL5120 includes a light intensity/brightness control which will not affect colour, it also has an automatic voltage switch range, covering 110-230V. Fibre optic light pipes are offered separately, as single or two arm, with various extension options.

Model KL5125 includes light intensity/brightness control, and is fitted with a halogen mirror lamp (15V, 150W). Complete with automatic voltage switching, covering 110-230V range. Fibre optic pipes with one or two arms are available separately, together with optional extension pipes.

Accessories for all models include focusing lens, diffuser lens, polarisation filter and a halogen lamp set.

For prices and availability information on Fibre Optic Light Source units, please contact your nearest Krüss distributor, who will be delighted to help. For full technical specifications, please download the relevant datasheet here.

Krüss Gemmo-Shop
You can find our Cold Light Sources in the Gemmo-Shop.


Fibre Optic Light – an overview

An optical fibre is a cylindrical waveguide transmitting light along its axis, by the process of total internal reflection. The fibre consists of a core surrounded by a cladding layer, both of which are made of dielectric materials.

Optical fibres are commonplace in providing illumination, and are used as light guides in many applications where a bright light needs to be shone on a target without a clear sight path.

Surprisingly, this is an old technology, dating back to the 1840s, when guiding of light by refraction was demonstrated by Colladon and Babinet. However, in 1870, John Tyndall reported, “When the light passes from air into water, the refracted ray is bent towards the perpendicular… When the ray passes from water to air it is bent from the perpendicular… If the angle which the ray in water encloses with the perpendicular to the surface be greater than 48 degrees, the ray will not quit the water at all: it will be totally reflected at the surface…. The angle which marks the limit where total reflection begins is called the limiting angle of the medium. For water this angle is 48°27′, for flint glass it is 38°41′, while for diamond it is 23°42′.”

Today, fibre optic light technology is used across every industry from effective, simple units as described above, to complex medical and industrial applications.

KL5125 Fibre-Optic Light Source
KL5125 Fibre-Optic Light Source

KL5120 Fibre-Optic Light Source
KL5120 Fibre-Optic Light Source

KL5110 Fibre-Optic Light Source
KL5110 Fibre-Optic Light Source