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LED instruments cannot be used to create a hard-edged beam, which is needed for gobos and other effects which require the use of an ellipsoidal reflector spotlight, [3] though LED fixtures are now made that through the use of a small number of high-output diodes now allow the beam to be focused to a "hard edge", allowing full use of gobo/beam ...
LED instruments are an alternative to traditional stage lighting instruments which use halogen lamp or high-intensity discharge lamps. Like other LED instruments, they have high light output with lower power consumption. Most LED fixtures use three or more colors (usually red, green, and blue) which can be mixed to hypothetically create any color.
A 230-volt LED filament lamp, with an E27 base. The filaments are visible as the eight yellow vertical lines. An assortment of LED lamps commercially available in 2010: floodlight fixtures (left), reading light (center), household lamps (center right and bottom), and low-power accent light (right) applications An 80W Chips on board (COB) LED module from an industrial light luminaire, thermally ...
One-color light is well suited for traffic lights and signals, exit signs, emergency vehicle lighting, ships' navigation lights, and LED-based Christmas lights. Because of their long life, fast switching times, and visibility in broad daylight due to their high output and focus, LEDs have been used in automotive brake lights and turn signals.
An active constant current source is commonly used for high power LEDs, stabilizing light output over a wide range of input voltages which might increase the useful life of batteries. Active constant current is typically regulated using a depletion-mode MOSFET (metal–oxide–semiconductor field-effect transistor), which is the simplest ...
However, fluorescent lights are being used more and more for special effects lighting in theaters. High-intensity discharge lamps (or HID lamps), however, are now common where a very bright light output is required—for example in large follow spots, hydrargyrum medium-arc iodide (HMI) floods, and modern automated fixtures. [18]
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