A
Optical radiation, including light from artificial sources, may cause so-called photobiological hazards to the eye and skin. This is a problem widely discussed in the lighting industry, which leads to many misunderstandings and doubts. These may result, on the one hand, from the fact that the assessment of these hazards requires specialist knowledge and experience, [...]
L
Visual evaluation of colours in printing and graphic arts industries is of key importance for the process of colour management and verification of print quality. In order to properly assess colour, it is necessary to ensure proper lighting conditions, as described in ISO 3664:2009 standard. Despite the fact that almost 10 years have passed since [...]
B
Introduction The EN 62471 standard is one of the most important documents discussing photobiological hazards. The standard defines principles which should be followed to assess photobiological hazards and safety of artificial and natural sources of optical radiation. It covers all kinds of sources emitting optical radiation in a very wide range of wavelength – in [...]
U
As modern energy-efficient lighting technologies, including LED-based solid-state lighting (SSL), proliferate in our environment, awareness of their impact on biology and even technology evolves as well. LED lighting’s rapid development and assimilation, often without clear standards, may result in lighting flicker with adverse effects. Many organizations, including international standards bodies and regulatory agencies, and industry [...]
S
While photodetectors have long been used alongside goniometers to characterize light sources, PASI MANNINEN and MIKOLAJ PRZYBYLA explain that a GONIO-SPECTROMETER system enables collection of a more robust set of parametric data for LED-based products. Published on Sep 3, 2015 in LEDs MAGAZINE by Mikolaj Przybyla COO at GL Optic and Pasi Maninen a goniometric systems [...]
L
Standards prescribe integrating sphere size based on luminaire size, but MIKOŁAJ PRZYBYŁA explains that, for many product development and test purposes, a smaller sphere can deliver acceptable measurement accuracy. Published on: March 27, 2018 in LEDs MAGAZINE By Mikołaj Przbyła GL Optic Integrating spheres are fast and convenient tools for measuring the radiant or luminous flux of light sources. Such [...]
W
Optical radiation in the visible range, primarily white light with correlated colour temperature ranging from 3000 to 6500 K, can be emitted by electroluminescence diodes available in different technologies. For this reasons LED modules, integrated LED lamps and LED luminaries differ with respect to the quantity and quality of emitted radiation. Reliable measurements and comparisons [...]
U
LEDs have opened up new dimensions of design freedom, allowing architects and designers to give free rein to their creativity. Light-emitting diodes permit manifold design solutions as a light source in illumination products. However, a suitable measuring method for comparing key technical data is required in order to get the best out of the diversity [...]
P
The latest CIE S 025/ E:2015 standard provides the conditions required to perform reproducible photometric and colorimetric measurements on LED lamps, LED modules, and LED luminaires (LED devices). The main goal here is to obtain reliable and accurate photometric data for LED devices and ensure that the data is consistent, meaning that the results are [...]
M
A MacAdam ellipsis is a region on a chromaticity diagram which contains all colors which are indistinguishable to the average human eye from the color at the center of the ellipse. The contours of the ellipse represent the just noticeable differences of chromaticity. MacAdam ellipses help to show differences of chromaticity between two light sources [...]
