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A fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor, to produce ultraviolet and make a phosphor coating in the lamp glow.
Solar street lights raised light sources which are powered by photovoltaic panels generally mounted on the lighting structure. The solar array of such off-grid PV system charges a rechargeable battery, which powers a fluorescent or LED lamp during the night.
Iridescent mid altitude clouds Iridescent polar stratospheric cloud at sunset over Aberdeen, Scotland Cloud iridescence, seen above the clouds covered with grey clouds, Pondicherry, India. Cloud iridescence or irisation is a colorful optical phenomenon that occurs in a cloud and appears in the general proximity of the Sun or Moon.
His 1960 Pirelli Tower in Milan was a prominent example of postwar European night architecture, using ceiling fluorescent lights in the three vertical sections into which the building is divided, and rooftop floodlights reflecting off the bottom of a cantilevered roof; [62] Walter Gropius and Pietro Belluschi's Pan Am Building was influenced by ...
“Glowing silver-blue clouds – called noctilucent or night shining clouds – sometimes light up summer night skies,” EarthSky explained. However, this sighting in Palm Desert is rather rare ...
A troffer is a rectangular light fixture that fits into a modular dropped ceiling grid (i.e. 2' by 2' or 2' by 4'). Troffer fixtures have typically been designed to accommodate standard fluorescent lamps (T12, T8, or T5), but are now often designed with integral LED sources. Troffers are typically recessed sitting above the ceiling grid, but ...