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These lamps use a bi-pin connector for power: 12-volt MR11 bulbs usually use a GU4 base, and 12-volt MR16 bulbs usually use a GU5.3 base. The common 12-volt MR16 lamps, therefore, require a ferromagnetic or electronic transformer —sometimes misnamed as a ballast —to convert the 120- or 230-volt mains voltage to the extra-low voltage ...
Some LEDs are rated as having a 120° beam angle, [7] directed "up", i.e. perpendicular to the mounting surface. 'Side view' or 'edge emitter' SMDs are designed such that light is emitted parallel to the adhering surface (i.e., 90 degree difference to typical tape design).
Beam spreads are designated as FL , SP , NSP (narrow spot), and VNSP (very narrow spot), as stamped on the back of the lamp's reflector. PAR38 lamps, with an E22 base and with ratings up to 150W, were often used for domestic outdoor floodlight illumination for patios, backyards, and often combined with a PIR sensor switch as a security ...
Beam angle Heatsink Efficacy (min) (lm/W) Efficacy (max) (lm/W) Colors per SMD package 8520 8.5 × 2.0 0.5 & 1 55–60 80 110 120 Monochrome 7020 7.0 × 2.0 0.5 & 1 ...
Weatherproof casings are available for outdoor spot and flood fixtures. 120 V sizes: PAR 16, 20, 30, 38, 56 and 64 230 V sizes: PAR 16, 20, 30, 38, 56 and 64 Available in numerous spot and flood beam spreads. Like all light bulbs, the number represents the diameter of the bulb in 1 ⁄ 8 of an inch. Therefore, a PAR 16 is 51 mm (2 in) in ...
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The two teams were tied 21–21 at halftime before Louisville scored the next two touchdowns. The Cardinals took a 35–21 lead with two minutes remaining in the third quarter on a 54-yard run ...
An integrating sphere can be used to measure the diffuse reflectance of surfaces, providing an average over all angles of illumination and observation. A number of methods exist to measure the absolute reflectance of a test object mounted on an integrating sphere. In 1916, E. B. Rosa and A. H. Taylor published the first such method. [7]
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