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2. Surya Roshni - Wikipedia

   en.wikipedia.org/wiki/Surya_Roshni

   Surya Roshni Limited (formerly Prakash Surya Roshni Limited) is an Indian multinational company headquartered in Delhi that produces fans, [4] steel, lighting, LED, [5] [6] kitchen appliances [7] and PVC pipes. Surya exports its products over 44 countries [8] and is one of the top manufacturers of LED lights in India. [9]

3. Marks & Spencer - Wikipedia

   en.wikipedia.org/wiki/Marks_&_Spencer

   Marks and Spencer plc (commonly abbreviated to M&S and colloquially known as Marks or Marks & Sparks) is a major British multinational retailer based in London, England, that specialises in selling clothing, beauty products, home products and food products.

4. Ceiling fan - Wikipedia

   en.wikipedia.org/wiki/Ceiling_fan

   Ceiling fans are usually installed in a space with other lighting fixtures, but if the fan is positioned too close to a light panel or fixture, a strobe or flicker effect may occur. A strobe or flicker effect is a phenomenon which occurs when light brightens and dims consistently as it penetrates and passes through a moving ceiling fan. [ 8 ]

5. 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 ...

6. Light-emitting diode - Wikipedia

   en.wikipedia.org/wiki/Light-emitting_diode

   Light can be used to transmit data and analog signals. For example, lighting white LEDs can be used in systems assisting people to navigate in closed spaces while searching necessary rooms or objects. [100] Assistive listening devices in many theaters and similar spaces use arrays of infrared LEDs to send sound to listeners' receivers.

7. This Chronic Skin Condition Is A Common Cause Of Dark ... - AOL

   www.aol.com/lifestyle/chronic-skin-condition...

   During this process, a lamp that uses long-wave ultraviolet (UV) light will make certain cells show color or appear fluorescent, according to the Cleveland Clinic. Doctors also take time during ...