The Blizzard Lighitng IRISDefinition:
The variable aperture (Opening) in a lens, which controls the incoming amount of light and depth of field.™ R3 is a professional LEDDefinition:
LED (Light-Emitting Diode): A semiconductor light generator used in displays, television, pointers and for general illumination. It is a low-power replacement for incandescent lamps. video panel for indoor rental, production, and install use.
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