What is light... exactly?

Is there more to light than what meets the eye?

Is light only electromagnetic radiation? Why is light so fascinating? Why did the most famous physicist of modern times devote hi life to studying light? What is this invisible phenomenon that makes everything visible? What do we know about light? What don't we know? What is light pollution? Can we shed some light on light?

»I plan to spend the rest of my life thinking about the nature of light.«

Albert Einstein


Our intention is to investigate and provide basic background information about light.

We wish to explain the scientific and physical fundamental aspects of light, describe the inner and outer perceptions of this phenomena, in easily accessible language. We aim to discuss ecological and health issues related to light, along with philosophical and humanitarian concerns. Above all, we hope to open up a multifaceted discussion about a fundamental aspect of our world.


LED risk? >>

How does semiconductor light production affect human health?

On this website you will find a lot of information about LED lighting. We take a look at how the technology behind it works and ask what differentiates LED light from other light. We look at the pros and cons of this new lighting technology and inquire into their effect on humans.

Licht-questions has been created as a networking platform,

a space to exchange and share information to a growing circle of readers. We aim to stay in constant development. Our objective is to provide leading research and studies in this field, particularly in the areas of health and vitality.

Who are we?

A group of people,

carrying heartfelt questions about light and lighting. People who would like to share their specialized experience and research with others. We are particularly concerned with the qualities of lighting and its effects on people and nature. We work in cooperation with other specialists and experts, especially in the field of lighting technology.



Natural light, artificial light, effects, inner light


Scientific history, terminology, bulbs: from incandescent to LED


Questions and answers, tips for further reading


Health considerations, lighting design in living and work spaces, technology, natural and artistic lighting


Effects of artificial light (in particular LED) in schools and in the food industry


The people behind Light-questions

We can easily forgive a child who is afraid of the dark; the real tragedy of life is when men are afraid of the light.