Power Matla Innolumis is the world leader in public lighting innovation. We have developed a pioneering concept for the illumination of public spaces. With sustainable LEDs we create light which perfectly matches the sensitivity of the human eye in evening and night-time vision. This way less energy is needed compared with conventional lamps, while at the same time better visibility is provided. We integrate knowledge of visual perception with the latest LED and lighting technologies − a Dutch invention which has brought about a breakthrough in sustainable public lighting. We are specialists in optimising the light spectrum for the human eye and our luminaires focus the light where you want it, with no waste and with no light pollution. Our products are designed in the Netherlands and continuously tested in our in-house laboratory, which has the most exclusive measurement equipment available. Our lighting systems offer a considerable contribution to sustainability, energy conservation and the reduction of CO2 emissions. Wasteful public lighting is history once and for all. Innolumis LED lighting is applied in residential neighbourhoods, alongside roads, in parks and in parking lots. In short, anywhere where public space is used in the dark. Our lighting creates a unique atmosphere in nature and rural areas where light pollution needs to be reduced to a minimum.
It is clear now that the human eye sensitivity curve changes or adapts to different light levels, and this more so when driving a vehicle at night. The S/P ratio is the ratio of how much we see with the rods (Scotopic) and how much we see with the cones (Photopic). As outdoor light intensities there is always a balance between the Scotopic and Photopic light.
In an integrating sphere one can measure the Photopic Lumen. The peak of the Photopic lumen is at 555 nm. Most spheres allow also measuring of the Scotopic lumen with the peak at 507 nm. Both measured values (Photopic Lumen and Scotopic lumen) can be expressed as S/P ratio which is the result of the division of Scotopic lumen/Photopic lumen.
Low Pressure Sodium Light (Left)
Innolumis Mesopic LED (Right)
To benefit of the higher sensitivity of the rods in the eye, light should have another spectral composition at different intensities. The goal is more sight with less light. Academic studies show that the ratio between Scotopic (night) and Photopic (day) vision, the so called S/P ratio, is a base which can be used to multiply the lumen with to express the real light perception.
Photopic LED technology and scotopically enhanced (Mesopic LED) technology is offered across our range of LED lights for each applicable project classification.
In street lighting application, some manufactures incorporate lenses for light distribution while others incorporate reflectors. In this project both design concepts were used to evaluate or compare light distribution patterns.
For light measurements purposes, the latest lighting measurement technology is used to measure the Photopic, Scotopic, and SP ratio and visual effective light levels.
By providing a light spectrum and colour mix using our patented RGB light source combinations, we are able to provide the right amount of light with the highest visibility, with low glare characteristics at the lowest energy consumption for the area of application. The above picture is an illustration of how vast the differences is where a Allen-key hand tool with multi-colours is photographed under both a 150 W Low Pressure sodium Street lamps, and our Nicole 56 W Mesopic LED Street lamp – where in both cases the measurement height/photograph height and the CRI is relatively low ( between CRI32 to CRI 36), with similar Photopic lux readings. But it is clear to the human eye that our Mesopic LED light provides much higher colour recognition and visibility.
Photopic vision: vision of the eyes under well-lit conditions, which provides for colour perception, and which functions primarily due to cone cells in the eye.
Scotopic Vision: vision of the eye under low light conditions, which function primarily due to rod cell in the eye.
S/P ratio: is the ratio of how much we see with the rods (Scotopic) and how much we see with the cones (Photopic).
Mesopic vision: a combination of Photopic and Scotopic vision under low light conditions, which function due to a combination of the rods and the cones.
Commercial photometry is based entirely upon the Photopic luminous efficiency function, which considers how the eye “sees” during daylight hours. As a result, conventional photometry may misestimate the effectiveness of some light sources used in night-time applications in terms of energy efficiency and visual safety, according to LRC Director Mark Rea, Ph.D., one of the authors of the ASSIST recommends volume.
“A unified system of photometry would help to more accurately characterize different light sources at any light level, facilitating the specification of effective lighting systems for different applications, including those used outdoors at night”, says Dr Rea.
The proposed unified system of photometry integrates both the Scotopic and Photopic luminous efficiency functions into a complete system that can be utilized across the entire range of light levels available to the human visual system. The system differentially weights the Scotopic and Photopic luminous efficiency functions depending upon light level.
“In effect, it is a system for choosing among commercially available light sources to deliver the same unified, rather than Photopic, photometric quantity”, says Dr Rea.
ASSIST is collaboration between researchers, manufacturers, and government organizations. Its goal is to identify and reduce major technical hurdles currently facing solid-state lighting. The Lighting Research Centre conducts research, demonstration, and educational activities on behalf of ASSIST.
The Lighting Research Centre (LRC) at Rensselaer Polytechnic Institute is the world’s leading centre for lighting research and education. Established in 1988 by the New York State Energy Research and Development Authority (NYSERDA), the LRC has been pioneering research in energy and the environment, light and health, transportation, lighting and safety, and solid-state lighting for more than 25 years. In 1990, the LRC became the first university research centre to offer graduate degrees in lighting and today the LRC offers both a M.S. in lighting as well as a Ph.D. to educate future leaders in lighting. Internationally recognized as the preeminent source for objective information on all aspects of lighting technology and application, LRC researchers conduct independent, third-party testing of lighting products in the LRC’s state of the art photometric laboratories, the only university lighting laboratories accredited by the National Voluntary Laboratory Accreditation Program (NVLAP Lab Code: 200480-0)