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2. Lumen method - Wikipedia

   en.wikipedia.org/wiki/Lumen_method

   In lighting design, the lumen method, (also called zonal cavity method), is a simplified method to calculate the light level in a room. The method is a series of calculations that uses horizontal illuminance criteria to establish a uniform luminaire layout in a space. In its simplest form, the lumen method is merely the total number of lumens ...

3. Lumen maintenance - Wikipedia

   en.wikipedia.org/wiki/Lumen_maintenance

   Lumen maintenance compares the amount of light produced from a light source or from a luminaire when it is brand new to the amount of light output at a specific time in the future. For instance, if a luminaire produced 1,000 lumens of light when it was brand new and now produces 700 lumens of light after 30,000 hours, then it would have lumen ...

4. Luminous efficacy - Wikipedia

   en.wikipedia.org/wiki/Luminous_efficacy

   The former sense is sometimes called luminous efficacy of radiation, [4] and the latter luminous efficacy of a light source [5] or overall luminous efficacy. [ 6 ] [ 7 ] Not all wavelengths of light are equally visible, or equally effective at stimulating human vision, due to the spectral sensitivity of the human eye ; radiation in the infrared ...

5. Architectural lighting design - Wikipedia

   en.wikipedia.org/wiki/Architectural_lighting_design

   The history of electric light is well documented, [11] and with the developments in lighting technology the profession of lighting developed alongside it. The development of high-efficiency, low-cost fluorescent lamps led to a reliance on electric light and a uniform blanket approach to lighting, but the energy crisis of the 1970s required more design consideration and reinvigorated the use of ...

6. High-CRI LED lighting - Wikipedia

   en.wikipedia.org/wiki/High-CRI_LED_lighting

   The "warmer" light colors, such as a 2700 K incandescent bulb or a 1700 K candlelight, are more easily reproduced than more neutral white lights, such as 4800 K direct sunlight, and thus usually have higher CRI ratings in alternative light sources such as CFL and LED bulbs; "warmer" light (redder) naturally renders colors less accurately.

7. MSNBC Reportedly Tells Two More Anchors To Take Pay Cuts Amid ...

   www.aol.com/msnbc-reportedly-tells-two-more...

   But perhaps more urgent is the station’s plummeting viewership. Its prime-time audience tanked 55% from Nov. 4 through Dec. 15, according to Nielsen ratings cited by The Wrap. (CNN, a mainstream ...