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There is more to lighting than meets the eye

Les Kacev is passionate about lighting education, measurement and the quality of light. He has run seminars, workshops and webinars for utilities, associations, universities, LED manufacturers, vendors, distributors, and conferences. A few examples follow

The human eye is truly our window to the world. Not only does it contain rods and cones which stimulate our vision, but it has recently been discovered that the eye contains a variety of intrinsically photosensitive retinal ganglion cells known as ipRGC which are involved in non-visual functions. Light and light quality play an immensely important role in stimulation of ipRGCs and in so doing determine our mood, sleep patterns, productivity, health and  general wellbeing. Light exposure plays an important part in our mental health.

Not only does light [natural and artificial] affect humans, but its impact on fauna and flora is only now being appreciated. Its influence on mammals, birds, bats, insects, fish and plant life has opened up a new branch of science.

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Les in association with LEDmetric/Elkays is a passionate promoter of solid state lighting education. When Les initiated his education programs and his methodology of determining light quality, many lighting professionals thought he was too technical. After all, you buy an LED lamp and screw it in the socket. What’s so difficult about that? We all know what a 60 Watt incandescent lamp is, so why can’t we do the same with a 10 Watt LED lamp? As lighting professionals have transitioned from traditional light sources to solid state lighting, Les has increasingly been recognized as one of the “go to LED gurus”.
He has taught workshops for utilities, professional groups, LED manufacturers and distributors in the following subjects.

Why is a single characteristic to describe LED lighting so Illusive.

What do we need to measure, how do we measure them and what background knowledge do we need to interpret the results.



Matching cameras and lights. Linear relationships in color. What can one fix in post-production and what cannot be fixed.

Characteristics of the visible spectrum. The eye as a window to the world. Visual and non-visual stimulation of the human eye. Human centric lighting - how we can use natural and artificial light to improve productivity, mood, sleep patterns and other aspect of the human condition.

The effects of artificial light on the environment, flora and fauna. Several chain reactions. How bridge lighting can affect the health of aquatic creatures. How lighting affects insects which then takes a toll on bats and birds.
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Anyone involved in solid state [LED, OLED, ILED and other emerging technologies] lighting needs a skill set which allows them to design and implement optimal lighting systems. Each project is different and one has to consider the objectives of the client, the needs of those subjected to the light, human centric and environmental effects.

All lighting professionals need a solid background to be effective in their fields. Through the chain this involves R&D engineers, manufacturers, quality control personnel, architects, lighting designers, integrators, contractors, utility workers, standards developers, distributors, sales personnel,  contractors, inspectors, property developers, end users, and more.

Lumens per watt and cost savings are not the only benefits of solid state lighting. If standards require other parameters, such as CRI or CCT, then devices to verify these need to be an integral part of the lighting professional’s toolbox.