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2. Parabolic aluminized reflector - Wikipedia

   en.wikipedia.org/wiki/Parabolic_aluminized_reflector

   For example, a PAR16 lamp is approximately 2 inches or 50.8 mm in diameter. [1] The size of rectangular PAR lamps is expressed as the letters REC followed by the reflector's mouth height, the letter "X", and the reflector's mouth width—with both dimensions in millimeters. For example, REC142X200 lamps are 142 high and 200 mm wide. [2] [3]

3. Stage lighting instrument - Wikipedia

   en.wikipedia.org/wiki/Stage_lighting_instrument

   All PAR lamps except those with narrow or very narrow lenses produce an intense oval pool of light, some with fixed focus and soft edges. [7] In order to adjust the orientation of the oval, the lamp must be rotated. [8] The number associated with a PAR light (e.g.: Par 64, Par 36, Par 16) indicates the diameter of the lamp in eighths of an inch ...

4. Photosynthetically active radiation - Wikipedia

   en.wikipedia.org/wiki/Photosynthetically_active...

   Photosynthetically active radiation (PAR) spans the visible light portion of the electromagnetic spectrum from 400 to 700 nanometers. Photosynthetically active radiation (PAR) designates the spectral range (wave band) of solar radiation from 400 to 700 nanometers that photosynthetic organisms are able to use in the process of photosynthesis.

5. NEMA connector - Wikipedia

   en.wikipedia.org/wiki/NEMA_connector

   RVs in the US are equipped for 120 V 30 A or 240 V 50 A service, and use a cord to connect to a receptacle at the campsite, usually on a power pedestal with one or more receptacles providing 120 V 30 A (TT30R), 240 V 50 A (14-50R), or 120 V 15/20 A (5-20R) service.

6. Combined Charging System - Wikipedia

   en.wikipedia.org/wiki/Combined_Charging_System

   CCS1 (Combined Charging System Combo 1) plug as used in North America. It is an extension of the J1772 standard AC charging connector. CCS Combo 1 vehicle inlet showing the J1772 and the two DC fast-charging pins Connectors: Incomplete Combo 2 (left) showing the two large direct current (DC) pins below, while the four alternating current (AC) pins for neutral and three-phase are removed, while ...

7. Mains electricity - Wikipedia

   en.wikipedia.org/wiki/Mains_electricity

   A 50 Hz ±5 Hz vibrating-reed mains frequency meter for 220 V. The world's first public electricity supply was a water wheel driven system constructed in the small English town of Godalming in 1881. It was an alternating current (AC) system using a Siemens alternator supplying power for both street lights and consumers at two voltages, 250 V ...