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The compact size of the MR base allows for much smaller, more discreet fixtures than the incandescent reflector bulbs that pre-dated MRs. The reflector controls the direction and spread of light cast from the lamp. MR lamps are available with different beam angles from narrow spot lights of as small as 7° to wide flood lamps of 60°.
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 ...
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 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 ...
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]
Four different beam angles can be obtained on the PAR-64. The beam angle is determined by the lamp. Lamps come in "very narrow" (6° x 12°), "narrow" (7° x 14°), "medium" (12° x 28°), and "wide" (24° x 48°). Each angle has two numerical values since the beams are elliptical rather than circular. PAR 16s are often referred to as "birdies".
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Sunlight forms a light beam (a sunbeam) when filtered through media such as clouds, foliage, or windows. To artificially produce a light beam, a lamp and a parabolic reflector is used in many lighting devices such as spotlights, car headlights, PAR Cans, and LED housings. Light from certain types of laser has the smallest possible beam divergence.
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