About us

A more natural artificial light has been our priority since the company started back in 2002. The founder was inspired in the USA, the country where 'high colour rendering' lamps have a long tradition. Initially we started by importing neodymium filament lamps, which then led to our own brand of lamps and luminaires: NASLI® in 2007 and the foundation of a specialized company NASLI spol. s r.o. a year later. NASLI stands for NAtural Spectrum LIghting.

In practice, we can easily find ourselves in a situation when two lamps with a very similar lumen value produce a very different atmosphere within the illuminated area. In our attitude, we handle this "atmosphere", the subjective evaluation of lighting by more individuals, as important as the objectively measurable parameters.

The research of Dr. John Ott has encouraged us to aim for replicating daylight as closely as possible. Dr. Ott found that some plant species were unable to flourish under certain types of artificial lighting. The light most similar daylight was found to be the most suitable for plants. Some very important information comes from the book "The effect of natural and artificial light via the eye on the hormonal and metabolic balance of animal and man." written by professor Hollwich, who observed the lowering of stress hormones in waiting patients after lamps producing a similar light to daylight had been installed.

The effect of light on the internal body clock (Circadian rhythm) has been the focus of our research for many years. We introduced a new method to compare the quantity (or quality) of light, called the Circadian Index Ac. This gives us a useful tool for comparing the circadian index of different lamps to daylight. Knowing this number, photometric values of the given light source can be converted to circadian values, reproducing the effect of light on the human neural system.

Since 2006 we have been interviewing our customers to find out what the public experience with the NASLI light is. We have mainly interviewed office and light industry workers. In comparison with the original lamps, 85% answered that they found the workplace more pleasant, 79 % can work longer and reverting back to the original light would be more disturbing for them and 63 % reported better levels of concentration. We offer a service of leasing out NASLI lamps to companies for evaluation, free of charge.

Since 2010 we have been developing our own luminaires. Maintaining the light qualities such as chromaticity, colour rendering and the circadian index, is at the very top of our list of priorities. We are creators of HLS® (Holistic Lighting System), a system of voluntary extensions of the existing standards for luminaires safety and mainly electromagnetic compatibility. Using suitable components and their placement in combination with line and output filters we can lower the emissions radiated from the luminaire to acceptable levels, even for people who consider themselves over sensitive to electromagnetic fields.

In 2012 we developed our first fullspectrum LED light with a colour rendering of 95 and chromatic temperature of 5200 K and efficacy exceeding 70 lm/W (including driver). Proper design of the driver can eliminate flicker, which is one of the keys to comfortable LED lighting.