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A LED (Light Emitting Diode) blub lamp (also called LED bar or Illuminator) is a type of solid state lighting (SSL) that uses light-emitting diodes (LEDs) as the source of light. They usually comprise clusters of LEDs in a suitable housing. They come in different shapes, including the standard light bulb shape with a large E27 Edison screw and MR16 shape with a bi-pin base. Other models might have a small Edison E14 fitting, GU5.3 (Bipin cap) or GU10 (bayonet socket). This includes low voltage (typically 12 V halogen-like) varieties and replacements for regular AC mains (e.g. 120 or 240 VAC) lighting. Currently the latter are less widely available but this is changing rapidly