Well, I guess I'd better get going on this. For my own reference (and in case anyone else wants to dig in), here's my current thinking on the final article list:

 Light-emitting diode: the primary article, with references to other articles in the LED family; would include packaging and material from current Electrical polarity of LEDs
 Organic light-emitting diode: keep this separate since there seems to be a lot of good material here, although I haven't looked it over for redundancy
 LED circuit: the circuitry surrounding an LED (including material from LED power sources, Thermal management of high power LED, and LED as light sensor)
 LED physics: the internals of how LEDs function (including List of LED failure modes and Light extraction in LEDs)
 LED lighting: using LEDs to cast light on other objects (including material from Solid-state lighting and LED lamp)
 [LED stage lighting]] (keep as-is)
 LED beacon: using LEDs to call attention to an object (including material from LED anti-collision light, LED anchor light and Motorcycle LED Lighting)
 LED display: using LEDs to deliver information (e.g. status, images, video, text) (yes, there already is an LED display article, but it only covers video displays, which is overly specific given the broad title)
 LED art: self-explanatory (including material from Blinky (novelty) and LED Throwie)
 LED products: random LED-based products that I'm not sure fit elsewhere (e.g. LED Incapacitator, Individually Modulated LED, LED printer, DPL Therapy)

I'm least certain of the LED products page. I was thinking to gather together a set of LED-based products that (for the most part) don't really deserve their own articles. I'm no longer sure this is a useful path, though; perhaps these articles should just be improved in-place (or nominated for deletion). Thoughts?