light-emissive device

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• Game controller — A North American Super Nintendo game controller A game controller is a device used with games or entertainment systems used to control a playable character or object, or otherwise provide input in a computer game. A controller is typically… …   Wikipedia

• Electrical ballast — Choke ballast (inductor) used in older lighting. This example is from a tanning bed. Requires a lamp starter (below) and capacitor …   Wikipedia

• Contrast ratio — The contrast ratio is a property of a display system, defined as the ratio of the luminance of the brightest color (white) to that of the darkest color (black) that the system is capable of producing. A high contrast ratio is a desired aspect of… …   Wikipedia