Here are the various terminologies for developmental stages of LED in chronological order:

• LED Die - A small block of light emitting semi-conducting material on which functional LED circuitry is fabricated.
• LED Package - This includes an LED die or more than one LED die with an optical element and mechanical, thermal and electrical interface.
• LED Module - This includes and LED package or an LED die, possibly with an optical element connected to a circuit board, and with thermal, mechanical and electrical interface that are intended to be connected to the load side of the driver.

LED Engine - This is an LED module or array of packages with the associated control gear / LED driver. It is the nearest equivalent to the lamp in a conventional luminaire
 
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