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2. Guide number - Wikipedia

   en.wikipedia.org/wiki/Guide_number

   Cameras with focal-plane shutters—even if they had PC connectors with X, F, M, or S-sync delays ("xenon sync" with zero delay and flashbulbs with peak delays of 5, 20, and 30 ms)—could not be used at speeds that attenuated guide numbers with most types of flashbulbs because their light curves were characterized by rapid rise and fall rates; the second shutter curtain would begin wiping ...

3. Fluorescent-lamp formats - Wikipedia

   en.wikipedia.org/wiki/Fluorescent-lamp_formats

   Like the European modular furniture, display cabinets, ceiling tile grids, etc. they were designed for, these are based on multiples of the 300 mm (11.8 in) "metric foot" instead of the 12 in (305 mm) imperial foot, but are all 37 mm (1.5 in) shorter to allow space for the lampholder connections within the 300 mm modular units, and for much ...

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. 50 Times Cheap Fixes Had A Major Impact On Home Life - AOL

   www.aol.com/55-people-share-relatively-cheap...

   The only lighting my house had was from ceiling fans so most of the rooms were way too dark. Adding 4 recessed lights on a dimmer switch is under $200/room and is such a quality of life ...

6. Wheelock (brand) - Wikipedia

   en.wikipedia.org/wiki/Wheelock_(brand)

   Wheelock produces the S8-24 series ceiling speakers and speaker strobes. The S8-24 speaker strobes are an 8 inch ceiling speaker, with a strobe on top of the grill. They are xenon multi-candela strobes and are made for indoor areas.

7. ‘Mufasa’ Rules Post-Christmas Box Office With $12 Million ...

   www.aol.com/mufasa-rules-post-christmas-box...

   “Mufasa,” “Sonic 3,” and “Nosferatu” took the top three spots on the Thursday box office chart, leaving Universal’s “Wicked” and Disney’s “Moana 2” to round out the top ...