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 …
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 … Read More
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 … Read More
CRI measures on a scale of 0 to 100 how a light source shifts the location of eight specified pastel colors compared to the same colors lit by a reference light source of the same CCT. A CRI of 100, or perfect color rendering, means the light source renders the eight colors exactly how the reference light source renders them.
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). All packages of light bulbs sold in stores after the New Year will carry … Read More