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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).
Non-SMD types of LED lighting also exist, such as COB (chip on board) and MCOB (multi-COB). Surface-mounted device LED modules are described by the dimensions of the LED package. A single multicolor module may have three individual LEDs within that package, one each of red, green and blue, to allow many colors or shades of white to be selected ...
When dealing with a beam that is nearly parallel to a surface, it is sometimes more useful to refer to the angle between the beam and the surface tangent, rather than that between the beam and the surface normal. The 90-degree complement to the angle of incidence is called the grazing angle or glancing angle. Incidence at small grazing angles ...
However, because of the lack of dynamic control over the beam diameter, shape and sharpness, PARs are rarely used as Front of House lights other than for front washes but can be used for special effect lighting such as lighting from directly above or from extreme angles as well as general wash lights overhead/above stage. If used cleverly, par ...
Beam lights are often built much like the spot in terms of functionality aside from one key difference: beam lights use a wide lens to make an even more extreme beam. A typical spot has a beam angle from 15 to 35 degrees, whereas an average spot has a beam angle of three to seven degrees with some high end companies producing lights with zero ...
Luminous intensity is the perceived power per unit solid angle. If a lamp has a 1 lumen bulb and the optics of the lamp are set up to focus the light evenly into a 1 steradian beam, then the beam would have a luminous intensity of 1 candela. If the optics were changed to concentrate the beam into 1/2 steradian then the source would have a ...