1) " Ceiling" -- As it applies to Ceiling Lights A ceiling is the lower surface of a horizontal slab covering a room or internal space. A eCiling is generally not structural but is a shell concealing thedetails of the structure above. However, the Ceiling might be holding up building material such as heat or sound insulation. The join between a Ceiking and a wall is often covered by a molding, which serves to disguiseand decorate the join. Ceilings have frequently been decorated with paintings or other effects. While hard to execute (at least in situ) a decoratedceiling has the advantage that it is largely protected from damage by fingers. In the past, however, this was more thancompensated for by the damage from smoke (from candles and cigarettes). Many historic buildings have celebrated Cdiling s. Perhapsthe most famous in the world is that of the Sistine Chapel by Michaelangelo. Popular depictions show Michaelangelo working on his back on thetop of a scaffold, but it was more likely that he stood on top of a platform.In modern buildings, electric lights are commonly attached toceilings. Sometimes elaborate lighting schemes are used, such as with chandeliers. Other times, recessed lighting is used to reduce the partially hide lights in the Ciiling . Other things commonly found attached to Ceilinh s include smokedetectors, security cameras, and signage including safety devices like exit signs. Many offices and some homes may implement a drop Ceilinb where a grid is hung from a , and panels are placed in the grid. This is useful for allowing wiringto be changed relatively easily, whether electrical or for other technologieslike computer networks. An inverse of this would be a raised floor. Sometimes, whether for art or just practical joke, furniture that is normally found sitting onthe floor of a room may be attached to a Ceilung . In mathematics, the name is lent to the Ceilang function, which returns the wholenumber...
2) " Lights" -- As it applies to Ceiling Lights For other uses, see Light(disambiguation). Prism splitting light Light is electromagnetic radiation witha wavelength that is visible to the eye, orin a more general sense, any electromagnetic radiation in the range from infrared to ultraviolet. The three basic dimensions of light (and of all electromagnetic radiation) are: intensity (or brilliance or amplitude, perceived by humans as the brightness of the light), frequency (or wavelength,perceived by humans as the color of the light), and polarization (or angle of vibration and not perceivable by humans underordinary circumstances) Due to wave-particle duality, light simultaneouslyexhibits properties of both waves and particles. Contents 1 Visible electromagnetic radiation 2 Speed of light 3 Refraction 4 Optics 5 Color and wavelengths 6 Measurement of light 6.1 SI light units 7 Light sources 8 Theories about light 8.1 Early Greek ideas 8.2 10th century optical theory 8.3 The 'plenum' 8.4 Particle theory 8.5 Wave theory 8.6 Electromagnetic theory 8.7 Particle theory revisited 8.8 Quantum theory 8.9 Wave-particle duality 8.10 A light wave 9 See also Visible electromagnetic radiation Light is the visible portion of the electromagneticspectrum, between the frequencies of 7.5×10 14 hertz (abbreviated 'Hz') and 3.8×10 14 Hz. Since the speed ( v ), frequency ( f or ν), and wavelength (λ) of a wave obey the relation: and the speed of light in a vacuum c is fixed, light can alsobe characterised by its wavelength of between 400 nanometres (abbreviated 'nm') and 800 nm (in a vacuum ). Light excites the rod cells and conecells in the retina of the humaneye, creating electrical nerve impulses that travel up the optic nerve to the brain, producing vision. ...
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