by Luca Marinozzi
We are immersed in light on a daily basis. Light can be delicate, soft, blinding, warm, limited, blurry, geometrical, diffuse, dark. When we enter a room, or a badly-lit square, we perceive it immediately, and we feel a little uneasy when walking down dark alleyways. Light attracts us. It constantly draws our eye, it can change our way of perceiving and experiencing a space; light is quality of life.
Technological evolution, which has led the lighting sector to throw open the doors to LED light sources, has presented us with a wide array of new possibilities. The LED is commonly known for its results in terms of energy saving, and we recently learned that it can be “smart”, but the truth is that there is so much more to be discovered. The greatest innovation introduced by the LED is customisation. The variety of light sources available on the market is such that one of the main tasks of those who design and build lighting fixtures is knowing how to choose the LEDs with the most suitable characteristics for the different types of application.
If we were to light up the façade of a historical building, I would require a light with different characteristics compared to one used to light up a street. This applies both to the colour components and the shape of the photometric solid emitted by the lighting fixture.
But what exactly are the characteristics we are talking about? At least 4 main elements must be identified: CCT, SDCM, CRI and light distribution.
The CCT (Correlated Colour Temperature) is calculated by determining the chromaticity coordinates x and y of the light source in question by correlating them with the Planck curve through the iso-temperature curves which intersect the Planck curve itself. Lower colour temperatures are associated with warmer colours, and vice versa, higher colour temperatures are associated with cooler colours. Due to how it is defined, the CCT cannot uniquely identify the chromaticity of a light source. To be clearer, two light sources with the same colour temperature will not necessarily also have the same chromatic coordinates, meaning that they could be chromatically different to the eye.
That is why we are not limited to using only CCT, but rather the use of the MacAdam ellipse step has also been introduced, as well as the SDCM (Standard Deviation of Colour Matching), a measurement of chromatic consistency. This value is the method to evaluate the chromatic distance of a light source from its Planckian equivalent. The greater the number of steps that the light source falls into, the higher its chromatic distance will be, with a smaller number of steps corresponding to a shorter distance. Solutions with a number of steps less than or equal to 4 are very good, considering that variations below 3 MacAdam steps are barely perceptible to the human eye.
Light, however, has the purpose of illuminating objects, people, spaces, and we know that the way that these appear depends upon the light that illuminates them. Think back to the streets lit by those old, hot sodium lamps. With a light source such as this, it becomes very difficult to ascertain what the actual colour of the space being illuminated is. We therefore come to add another essential element that describes the quality of a light source, i.e. the way in which it renders the colours of an object when it illuminates it. That is why the CRI (Colour Rendering Index) was introduced, in order to describe a light source’s capacity for colour rendering. This is defined by the CIE as “the effect of an illuminant on the colour appearance of objects by conscious or subconscious comparison with their colour appearance under a reference illuminant”. To simplify, we can say that the CRI represents a quantitative evaluation of a light source’s ability to represent more or less faithfully the colours of an object in comparison to natural light. The higher the CRI value, the more “natural” the rendering of the colour. Nowadays, LED light sources which range from CRI70 up to CRI99 can be found on the market.
However, it is not enough to have such flexible and high-quality light sources available if you are not capable of modelling the light according to your needs. As such, optical design represents the fourth cardinal element which characterises high-quality lighting. We could say: when it is needed, in the shape it is needed in. Since the right shape allows us to design a façade, highlighting certain elements and hiding others, it allows us to have uniformly-lit streets whilst using less energy.
Anyone who producers light fittings must know how to carefully balance all of these elements, ever focused on their application and knowing that good lighting also leads to a higher quality of life.
To revisit the previous examples, when we wish to illuminate a street, there is no need to have a high colour rendering index - a CRI70 will suffice - just as there are no predetermined constraints on the colour temperature (unless specific legal requirements are in place, for example Regional Laws). Close to an observatory, we can (and must) choose a 3000 K or 2200 K solution; in order to achieve greater energy savings, we can opt for a 4000 K CCT, currently one of the most efficient light sources. The two most important elements, on the other hand, are the SDCMs and the shape of the light; a solution with 4 SDCM steps allows us not to have colour variations within the same street, whilst the use of the appropriate photometric solid for the type of street geometry allows us to optimise the power being consumed and fall in line with the legal requirements.
Conversely, if we wanted to light up the façade of a historical building, all 4 elements must be carefully selected in the most appropriate fashion. The colour temperature should be chosen according to the type of architecture and material, the colour rendering index can be chosen with medium-high values (CRI70 or CRI90), the number of SDCM steps absolutely cannot exceed 4, whilst it is necessary to have a certain number of optical solutions available to be able to design the wall.
Good lighting needs high-quality light, and there can be no high-quality light without a great deal of research and expertise.
Urban lighting can improve even further. We believe that nowadays, all the ingredients needed to create good lighting are available, but laymen are lacking the culture of light
This year, Cariboni donated lighting to the Dynamo Vegetable Gardens, a new structure which will allow the Camp to offer special new activities for both younger and older children.
We are currently in the midst of a phase of radical changes. Innovating is paramount: customer expectations evolve, regulatory requirements become more complex and the competition increases.
The value of our lighting solutions is to be found not only in the development process but also in the ability to create synergy with the productive realities of the territory.
Cariboni Group with its partner SLF takes part in Belektro 2018, proven industry platform for new product launches. Stand 217 - Hall 2.2 at Berlin ExpoCenter City from 6th to 8th November.
Made in Italy lighting in 2017 generated an export of 2.2 billion, an increase of 1.9% over the previous year. Abroad, Made in Italy is a renowned brand, synonymous with beauty, passion, creativity, culture and quality.
A new revolution of Lighting seems to be around the corner, which is there for all to see. The LED revolution has already ended, modifying the lighting world, but the change that is about to take place is far greater and deeper.
The introduction of the Internet-of-Things (IoT) in the city thus becomes an essential social need to create an infrastructure able to offer new opportunities to use public spaces and improve the quality of life of people.
Cariboni Group presented The Geography of light, at Light + Building, the most important event of lighting and smart building held in Frankfurt from March 18th to 23rd.
From 18th to 23rd March 2018 we will be happy to welcome you at The Geography of light Hall 3.1 Booth B61, an experiential tour through the places we live every day.
On March 1, 2018 Cariboni Group was born, a group that combines the experience and expertise of two Made in Italy brands: Cariboni Lite specialized in architectural lighting and Fivep SpA dedicated to urban street lighting.
On the occasion of the 7th International Symposium dedicated to the LED Professional Cariboni group presented the research: "Impact of spectrum and color temperature of white LED light sources on circadian clock and melatonin suppression".
Cariboni group with its partner Delsana takes part in Kommunale 2017, International Trade Fair and Convention for Public Equipment, Stand 647 - Hall 9 at Messezentrum Nürnberg from 18th to 19th October.
Cariboni group renews its presence at Light Middle East 2017, organized by Messe Frankfurt, 17-19 October 2017 at stand B16 - Hall 2, Dubai International Convention and Exhibition Centre.
Cariboni group is responsible for the LED programme for Rome; the largest-scale substitution of public lighting currently under way in Europe, which will allow the capital to save approximately 19 million euros a year.
Cariboni group renews its presence at Light Middle East 2016, the most important exhibition in the Middle East dedicated to Lighting, organized by Messe Frankfurt from 31st October to 2nd November 2016 at the Dubai International Convention and Exhibition Centre (United Arab Emirates).
Cariboni group continues its partnership with Energy-Efficient Street Lighting Roadshow, project initiated by dena as part of the campaign for energy efficiency; the last stage is Regensburg.
A lantern specifically designed to house the LED technology. Colour temperature available: 4000K, 3000K and the new 2200K, the most appropriate colour temperature for old villages, old town and tourist centers that require the replacement of products with traditional high pressure sodium lamp.
Cariboni group with its partner SLF take part in Belektro 2016, proven industry platform for new product launches. Stand 116 - Hall 2.2 at Berlin ExpoCenter City from 11th to 13th October.
Ekleipsis and M48 AREA are candidates for the first edition of Archiproducts Design Awards. Until 10th October 2016 you can vote your favourite product getting an extra 10% discount to use on Archiproducts Shop.
The video contest "Riprenditi la città, Riprendi la luce" (Retake the city, film the light), organized by AIDI (Italian Lighting Association) becomes an exhibition at Fabbrica del Vapore, realized on the occasion of the XXI International Exposition, Triennale di Milano.
Cariboni group continues its partnership with Energy-Efficient Street Lighting Roadshow, project initiated by dena as part of the campaign for energy efficiency; the third stage is Karlsruhe.
Cariboni group is partner of Energy-Efficient Street Lighting Roadshow, project initiated by dena (German Energy Agency) as part of the campaign for energy efficiency sponsored by the German Federal Ministry of Economics Affairs and Energy.
Cariboni group took part in Light + Building 2016, the most important event in the world dedicated to the Lighting, held in Frankfurt am Main (Germany) from 13th to 18th March 2016.
Ekleipsis wins the prestigious Design Plus Award 2016, organized by Light + Building and the German Design Council. Once again "Made in Italy" is synonymous with international quality.
Cariboni group and Euro-Light together for ŚWIATŁO (Light) 2016, 24th International Fair of Lighting Equipment, from 27th to 29th January 2016, stand D28 - Hall 1, at the Warsaw Centre EXPO XXI, Poland.
Cariboni group is "gold sponsor" of the third edition of the International video contest "Riprendi-ti la città, Riprendi la luce" (Retake the city, film the light), a series of short films organized and promoted by the cultural nonprofit AIDI (Italian Lighting Association) in collaboration with the Fondazione Triennale and with the patronage of important institutions such as the FAI (Italian National Trust).
Cariboni group presents Ekleipsis leaflet. The location is the charming former Italcementi cement plant of Alzano Lombardo, the product is Ekleipsis, indirect light luminaire for ceiling, surface, recess, bollard and pole installation.
Cariboni group is gold sponsor of Stadtlicht + Verkehr, the annual meeting, from 24th to 25th November 2015, where the network "LED Smart Lighting" brings together in Leipzig to discuss adaptive street lighting and urban telematics.
Cariboni group sponsored Light Design 2015, organized by ITMO University, Creative Association of Lighting Designers RULD and Higher School of Lighting Design of ITMO University, took place on 8th and 9th October 2015 at ITMO University of St. Petersburg.
Cariboni group takes part in Light Middle East 2015, the most important fair in the Middle East dedicated to Lighting sector, organised by Messe Frankfurt from 6th to 8th October 2015 at Dubai International Convention and Exhibition Centre.
The new size SMALL X for the KAI line, protagonist of Porta Nuova Smart Community in Milan. Lighting street professional fixtures extremely compact optimized and manufactured specifically to accommodate the latest generation LED sources.
On the occasion of the International Year of Light and the 20th anniversary of ASSIL (National Association of Lighting Manufacturers) will be held at Casa dell’Energia the General Assembly of ASSIL and the public event "Conjugating energy efficiency, comfort and safety: intelligent lighting for the Well-being of people”.
Cariboni group lights up the path dedicated to urban agriculture as part of the program of Expo 2015 initiatives for "Porta Nuova Smart Community", promoted by Riccardo Catella Foundation with Confagricoltura and Fondazione Nicola Trussardi.
The second edition of the international video contest, organised by AIDI, turned to end. More than 160 videos joined the competition from all over the world.
Cariboni group won the tender for the requalification of lighting of the outer road network of the city of Milan that lead to open the way to Expo 2015.
Like in Milan, as result of the Iren S.p.a. tender award, Cariboni group lights up the green areas and the cycle paths of the city of Turin with KALOS lighting fitting.
Cariboni group is "gold sponsor" of the second edition of the International video contest "Riprendi-ti la città, Riprendi la luce" (Retake the city, film the light), a series of short films organized and promoted by the cultural nonprofit AIDI (Italian Lighting Association) in collaboration with the Fondazione Triennale.
Cariboni group took part in Light Middle East 2014, the most important fair in the Middle East dedicated to Lighting sector, organised by Messe Frankfurt from 3rd to 5th November 2014 at Dubai International Convention and Exhibition Centre.
Cariboni group sponsored Light Design 2014, organized by ITMO University and Creative Association of Lighting Designers RULD, took place on 9th and 10th October 2014 at ITMO University of St. Petersburg.
Cariboni group took part in Light + Building 2014, the most important International fair dedicated to Lighting, which took place in Frankfurt am Main (Germany) from 30rd March to 4th April 2014.
At Spiga Street, sponsored by the Municipality of Milan Cariboni group switched on permanently the innovative smart city based on the latest "smart lighting" technologies.