Integrating energy-efficient lighting saves money, environment
Despite the economy’s anemic recovery, hotels are spending a lot more time and money on environmental and sustainability initiatives, and integrating energy-efficient lighting is a popular place to start reducing both carbon footprint and energy costs.…
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Green leadership: hotels moving on the path to sustainability
Consider Photopic, Scotopic, Mesopic Vision before Specifying Lumen Requirements
Are all Lumens Equal? Consider how the human eye perceives light
Merging photopic, scotopic vision cuts energy costs, boosts visibility perception
The science of measuring light, in terms of how the human eye perceives its brightness, is called photometry.
The eye has two primary light-sensing cells in the retina, known as photoreceptors, called rods and cones, referring to their geometric shapes.…
LUMENS: The new way to shop for light
New federal lighting regs to help consumers make ‘green’ lighting choices
Starting Jan. 1, 2012, new federal regulations will require the most common light bulbs to be more energy efficient. Specifically, bulbs must produce the same amount of lumens (light output) for less wattage (energy consumption).…
What is Full Spectrum Lighting?
Lighting spectrum – Natural and artificial lighting.
Light, as we humans see it, is electromagnetic radiation that’s visible to the human eye. It’s the part of the electromagnetic spectrum we call “visible light”.
The electromagnetic spectrum is the range of all frequencies, or wavelengths, of electromagnetic radiation – from very low energy frequencies like radio waves, to radiation with very high-energy frequencies such as gamma rays.…
Is Color Quality Scale (CQS) an improvement on CRI?
Solid state lighting industry at an impasse efforts to replace CRI with CQS (Color Quality Scale)
As advances in solid state lighting products, especially LEDs, continue to push into the marketplace displacing incandescent and fluorescent lighting products, it only stands to reason that evaluation methods for these products, such as the measurement of color fidelity, or CRI – now almost 50 years old – isn’t cutting it.…
Illuminance Explained
Illuminance: exploring ‘incident light’
Illuminance is the amount of light striking a surface – also known as incident light, where the “incident” is the beam of light actually landing on the surface.
Illuminance is calculated as the density of lumens per unit area and is expressed using footcandles (lumens/square foot) in the United States or the metric version, lux (lumens/square meter), elsewhere.…