Articles and Essays

Professional articles and essays about Light & Optics. Written by Manfred Eickhorst, previously published in international professional magazines and newspapers.

  • Excellent Lighting: A Necessity, Not a Luxury

    Excellent Lighting: A Necessity, Not a Luxury

    Article by Manfred Eickhorst, previously published on the ICA's website www.gemstone.org.

    The colour impression made by a gemstone is dependent on a remarkable number of influencing factors. There is the nature of the light source, the colours of the surroundings and background, and then of course the ethnic disposition of the man or woman who wears the stone. In addition to that, the eye of the beholder with its own individual colour perception and age, as well as its own particular traditional aesthetic sensibilities all play a part, too.

  • Why Fullspectrum Light is better for you

    Why Fullspectrum Light is better for you

    Fullspectrum light has a greater effect on the well-being than conventional light. Read more here.

  • How to reduce the surface reflections from a gemstone

    How to reduce the surface reflections from a gemstone

    One of the difficulties in viewing the interior of a gemstone with amicroscope is caused by light rays reflected back from the stone’s facets. How to reduce theses difficulties is described in this article written by Peter Read.

  • More light for elderly eyes at work and living

    More light for elderly eyes at work and living

    Professional article by Manfred Eickhorst, published in "Mensch & Büro" 3/2004.

    The eyes of elderly people need more light, but at the same time are dazzled more easily than younger eyes. Lamps designed for adjustment to personal needs of light improve the capacity of vision of the elderly. Furthermore electronic ballasts provide flickerfree light and changing colours of light a pleasant comfort for the eyes.