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Archive for 2012

Lighting Controls Keep Energy Costs Down, Visual Quality Up

Motion Sensor

From dimming to controlling lighting based on whether a room is occupied or not, the technology being applied to energy efficient lighting products is creating huge savings in energy, and also satisfying demands for environmental sustainability.

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Energy Efficient Lighting Solutions for Eldercare Facilities

The energy efficient lighting movement is taking hold around the country but nowhere does it seem more needed than in the nation’s eldercare and long-term care facilities. Thankfully, lighting solutions are available, regardless of type or size of the facility, to save energy and boost both comfort and safety for residents.

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Utility Rebates for Energy Efficient Lighting Upgrades

sustainable lighting consultation

Utility companies around the country are encouraging these efforts by offering energy efficient lighting upgrade and replacement rebates, some of which cover up to 50 percent of installation costs for retrofits. And, utilities aren’t the only source for rebates on purchases of energy efficient lighting products. …

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Green Leadership: Hotels Moving on the Path to Sustainability

Green Leadership Hotel Lighting

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. Learn why lighting retrofits are the low-hanging fruit when it comes to savings and green leadership

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What is a Lighting Ballast?


A lighting ballast has three primary functions: first, establish an electric arc through the lamp; second, limit current through the lamp after ignition; and third, compensate for variations in line voltage and ensure consistent lumen output. Learn the difference between traditional core-and-coil, and newer (and better) electronic ballasts …

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Ceramic Metal Halide Lighting Basics

CMH Street Lights in Chicago

Ceramic Metal Halide is relatively new light source, touted for being compact, efficient, and powerful. CMH is part of the high-intensity discharge (HID) lighting category, which offers the highest efficacy and longest life of any lighting type, and saves up to 90% of lighting energy when they replace incandescent lamps.

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Consider Photopic, Scotopic, Mesopic Vision before Specifying Lumen Requirements

Photopic Scotopic Mesopic vision

Commercial photometry is important for lighting installers and their clients in choosing the best locations to install fixtures as well as ensuring maximum efficiency of lighting systems. The science of measuring light, in terms of how the human eye perceives its brightness, is called photometry. …

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Illuminance Explained

Color Accuracy

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. Lumens are a measure of the quantity of light, referred to as luminous flux or just flux, emitted by a light source. When considering lighting applications, illuminance is used to measure …

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What is Full Spectrum Lighting?

Electromagnetic Spectrum

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. Sunlight is described as full-spectrum light and includes the range of wavelengths necessary to sustain life on Earth: infrared, visible and ultraviolet (UV). But the human eye only responds to the visible light component, […]

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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. As we mentioned in a previous article, CRI has been found to be an inaccurate, unreliable predictor of color preference of solid-state lighting products such as light-emitting diodes (LEDs), which emit a much different […]

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