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Brightness is an attribute of visual perception in which a source appears to be radiating or reflecting light. [1] In other words, brightness is the perception elicited by the luminance of a visual target.
Prior to the definition of the candela, a variety of units for luminous intensity were used in various countries. These were typically based on the brightness of the flame from a "standard candle" of defined composition, or the brightness of an incandescent filament of specific design.
During turn off, the forward voltage of the device must be limited until the current tails off. The limit is usually around 20% of the forward-blocking voltage rating. If the voltage rises too fast at turn off, not all of the device will turn off, and the GTO will fail, often explosively, due to the high voltage and current focus on a small ...