Lexicon Light

Effects of light

Areas of effect and light: perception, mood, well-being

With brightness and colour, light has an effect on our everyday lives.

In ‘sight’, lighting effects the way we perceive colour due to the colour rendering index of the light source. This means, for example, that a Bordeaux-red pullover will seem brown under the light of a neon tube because it cannot render the colour. In addition, the brightness and the direction of the light will affect the perception of contrasts and objects. If we find this perception more difficult, we must subconsciously strain to complete the same tasks.

The areas of mood and well-being are heavily influenced by light. This lies primarily in the effect of light on the human hormonal balance. The happiness hormone serotonin is produced, for example, through daylight, whilst the sleep hormone melatonin is predominant at night without the stimulation of light. In this way, our biorhythms are controlled through the changing light situation during our day. But the colour of the light can also have an effect on our mood. Green and yellow are relaxing, whilst blue light activates. This is why warm (yellow) light and cold (blue) light are used to support our everyday activities.

Primex light elements allow you to bathe spaces in a gentle light – in a brightness and colour temperature to match your preferences and requirements. Here, you are free to select the design so that the room can also be arranged according to colour.

Brightness – Lux

The lux, i.e. the unit of luminance, indicates how much light is dispersed onto any given surface. This is, for example, the textile of the light box (Lumen /sq m). The brightness of the surfaces is also measured in lux.

Examples of brightness:

  • Office – 500 lux
  • Cloudless summer day – 100,000 lux

Brightness – Lumen

The lumen, i.e. the luminous flux, is the total amount of visible light that is emitted from a source of light. This can be a single LED, for example. The brightness of a light source is thus measured in lumen.

Light colour – Kelvin

The light colour indicates whether the light is warm (yellow) or cold (blue). The effect of the light depends on the colour temperature. Cold light has a stimulating effect and is thus ideal for counteracting afternoon sleepiness or to wake up in the mornings. Warm light, on the other hand, promotes well-being and creates a pleasant atmosphere.

– warm-white < 4,000 K

– neutral-white 4,000 – 6,500 K

– cold-white > 6,500 K

Colour rendering index (Ra)

The colour rendering index describes the colour spectrum of a light source. The smaller the spectrum, the fewer colour nuances will be recognisable in that particular light. In the broad spectrum of modern, high-quality light sources, even the smallest colour nuances can be distinguished.

Examples of the effects of light

Source: Licht.de

Office/ open office field tests, reaction and performance tests

Duration: 4 weeks

Extensive lighting with warm-white and daylight-white light. Dynamic control of light colour / luminance: Stimulating morning mood, warm light mood in the evening, 1000 Lux and 8000 Kelvin at performance dip (activating)



– Employees subjectively more alert / measurably higher performance

– Improved reaction times and productivity


Field test manufacturing, production hall / manual production

Duration: 15 weeks

Individual work station lighting, infinitely adjustable up to 3000 lux



– greater sense of well-being

– 48 out of 49 engineers choose higher illumination levels long-term (500 lux would be ‘sufficient’)

– under higher levels of illumination, increase in productivity by approx. 8% for the same products / activities

Lexicon Acoustic


Unit of sound. A difference of 10 dB is approximately equivalent to “twice as loud”.

Examples: 60 dB – loud speech, stress limit

70 dB – household and office noise

85 dB – hearing protection required in industry


The frequency indicates whether the tone of the sound is deep (low frequency) or high (high frequency). The range of frequency audible for humans lies between 16 Hz and 20 kHz. Room acoustics deal with the range of 63 Hz to 4 kHz.

Reverberation time

This is the most important indicator in room acoustics. It describes the time that passes before the noise level in the room drops by 60 decibels.

A high reverberation time occurs when the noise is reflected off so-called “reverberant surfaces” such as glass, concrete or marble.

The reverberation time of a space can be measured using theoretical or practical methods to establish the existing situation. Based on this, we can establish the optimal acoustic solution for your rooms. Simply ask our team!

Sound absorption (sound insulation)

By using certain materials, the sound can be absorbed instead of reflected. This reduces reverberation, improves the acoustics of the room and creates ideal listening conditions. This means, for example, that intelligibility increases:

The sound absorbing capacity of materials can be evaluated in a reverberation chamber and measured using various units of measurement. The two most common parameters are the frequency-dependent sound absorbency level and the evaluated sound absorbency level.

Frequency dependent sound absorption grade α s

This describes in detail the absorbance capacity of the materials across the frequency range of 100Hz to 5,000Hz.

Evaluated sound absorption coefficient α w

This figure of between 0 and 1 provides information on the general absorption capacity of the materials and helps categorise materials into absorber classes from A to E.

Here, 0 describes zero absorption (0%) and 1 the highest possible level of absorption (100%).

Why optimise the acoustics of a space? Effects of poor room acoustics

  • the intelligibility of speech decreases
  • greater effort is required (to hear or concentrate)
  • quicker fatigue, drop in performance
  • drop in memory by up to 20%
  • stress, demonstrable through higher heart rate
  • even louder speech (self-reinforcement – so-called Lombard effect), strain on the voice
  • –> Long-term health implications through continuous stress(Voice, blood pressure, sleep disturbance, stress-related illness,…)

Effects of acoustic optimisation through sound-absorbing elements

  • reduction in reverberation (no “echo”)
  • improved intelligibility
  • improved concentration and performance
  • reduction in stress and stress-related complaints
  • creation of a pleasant acoustic ambience

Why Primex acoustic elements?

  • sound absorber class A
  • individual design and formats
  • use as acoustic picture, ceiling sail or room divider
  • baffles and free forms possible
  • flexible retrofitting, no construction work required
  • ecological materials, Öko-Tex certification, sublimation printing with water-based inks
  • B1 and A2 fire protection solutions

Standards / guidelines / recommendations

In the area of acoustics, there are mostly only recommendations rather than specific laws. However, the guidelines provide orientation.

  • DIN 4109: Sound insulation in structural engineering
  • Workplace Ordinance (ArbStättV) and Accident Prevention Legislation – “Noise” (UVV Lärm) Section 15
  • DIN 18041: Acoustic properties of small and medium-sized rooms
  • DIN 18032: Acoustic properties in sports halls – halls and rooms for sport and multipurpose use
  • VDI 2058: Occupational noise evaluation in consideration of varying activities
  • VDI 2569: Sound insulation and acoustic design in the office

Study on the topic – VDU work and noise

See study as PDF

Lexicon Frames


For our profiles we use aluminium of alloy 6063 to ensure highest stability and the best possible processing of the frames. The profile surface is anodized. This is a good corrosion protection since it is 15 µm strong.

Colour coating

The aluminium frames can be powder-coated in all RAL colours. Special colours, such as paints with a metallic effect, can also be applied.

This means that the frames can be matched to every individual design.

Structure of the aluminium frames

The frames are constructed from aluminium profiles, which are assembled into a frame using corner brackets. They are used as textile tension frames, i.e. they are covered with a textile print, which is assembled with rubber piping. Thanks to this piping system, the textile is removable and can be exchanged flexibly.

Assembly of the aluminium frames is quick and easy, and requires no special tools. This means that the frames can be shipped unassembled and you save transport costs.