Enabling LED Lighting within the Internet Of Things


The overall objective of the Phase II ELLIOT project is to develop an ecosystem of interconnected and standardized spectrally-tuneable lighting devices to reproduce natural daylight, including changes over the course of a day, with the highest visual quality and without resorting to very high illuminance (lux levels), which significantly improves comfort on people synchronizing the circadian rhythms.

Elliot project heavily focuses on wireless connectivity for spectrally-tuneable lighting systems that are evolving quickly and are likely to experience dynamic growth over the coming decades, due to the paradigm shift brought by the Internet of Things.

An additional objective is the creation of an online platform that will allow any lighting designer or even non-specialist, to capture, reproduce and share any light spectrum in the Ledmotive cloud.

Our technology

LEDMOTIVE focuses on the development of Spectrally-tuneable devices that have a huge influence on human health, mood and performance and also with the possibility of adapting the light spectrum to any specific need.

According to the World Health Organization (WHO), most people spend approximately 90% of their time living in indoor spaces. However, exposure to natural light has many health benefits: it facilitates nighttime rest, improves school performance and even significantly reduces the likelihood of mental illness at certain ages. For this, it is essential that the circadian rhythm (the biological clock that regulates the hours of sleep and wakefulness) is modified as little as possible. Experts in Chronobiology insist that certain type of light stimulates or inhibit the body’s production of melatonin. This hormone ensures that the biological clock is reset to zero every 24 hours and protects the body from inflammatory diseases and aging.
It is clear that the artificial lighting of interior spaces affects the production of melatonin and ends up modifying the sleep patterns of people who spend a lot of time in closed spaces.

Our idea is based on a family of products that includes: a light source capable of recording, process and playback any light spectral fingerprint in real-time, regardless of whether it is natural, artificial, or custom-made for a particular application. This system combines the light of 7 differentiated color channels to produce any spectrum of light within the visible range. This makes it possible to eliminate or modify the light that produces the most harmful effects (e.g. violet light) or to emphasize the light that provides the greatest benefits, depending on each correct moment and application. The daily solar pattern is not a simple change in light tonality (Correlated Color Temperature – CCT) but rather a complete and continuous evolution of the spectrum.

With LEDMOTIVE technology it is possible to configure a lighting sequence according to a 24-hour circadian cycle, which oscillates between the light spectrum of sunrise and sunset, reproducing the hourly variations of sunlight. In this way, the biological clock can be synchronized with artificial light, when there are reasons that prevent access to natural exposure.

The IP background necessary for the project is provided through a family of 10 patents (PCT/EP2011/050002 “Optoelectronic device, system, and method for obtaining an ambient light spectrum and modifying an emitted light” and PCT/ES2017/070041 “Controlling lighting devices”).


This is a selection of several scientific articles presented at scientific conferences and journals during the past two years.

Keynotes and papers in scientific journals and conferences

Type Authors and Title DOI / ISSN
Journal Luces CEI No 60 Aleix Llenas, Jorge Higuera, Josep Carreras. Tendencias en sistemas digitales de iluminación y conectividad. Luces CEI No 60. Pages 26-34.Year 2017 ISSN:
SPIE Optical Systems Design Conference Aleix Llenas and Josep Carreras “Methods to precisely generate arbitrary spectra using multi-coloured LED light engines”, Proc. SPIE 10693, Illumination Optics V, 106930M. Frankfurt, Germany (28 May 2018) DOI:
CIE conference Keynote Josep Carreras. Modulating the non-visual pathway via spectrally-tunable light engines for HCL. CIE Smart lighting conference Taipei. 24/04/2018. DOI:
SPIE Optical Engineering Journal Aleix Llenas and Josep Carreras “Arbitrary spectral matching using multi-LED lighting systems,” Optical Engineering 58(3), 035105 (29 March 2019) DOI:
CIE conference Llenas, A., Carreras, J. Enhancing comfort, alertness and productivity in indoor working environments using dynamic multi-channel led lighting systems that mimic daylight (OP06, 29-33).Conference proceeding by Commission Internationale de L’Eclairage,27 April 2018, Taipei, Chinese Taipei DOI:
SPIE OPTO Conference. Light-Emitting Devices, Materials, and Applications Aleix Llenas and Josep Carreras “Spectrally tunable LED light engines and the metamer optimization tool (MOTO)”, Proc. SPIE 10940, Light-Emitting Devices, Materials, and Applications, 109401L (1 March 2019); 2-7 February 2019 San Francisco, California, USA DOI:
Cornell University. Computer Science. Computers and Society Jorge Higuera, Aleix Llenas, Josep Carreras. Trends in smart lighting for the Internet of Things. (29 Aug 2018) arXiv:

Tools online

Ledmotive Lighting Tools Online and web for pilot test experiment

Type News / Press Website
Tool online MOTO: Metamer Optimization Tool http://tools.photonfy.com/moto
Tool online 24h Cycle Light Optimizer http://tools.photonfy.com/cyclo
Pilot test The effects of light on health, mood, and performance http://elliot.ledmotive.com/arup