AlInGaP LED's are red, orange, yellow. I think (hope) that the pricing quoted is for the reds rather than the blues.
Ultrabright Orange-Red, Orange, Yellow, and Green, InGaAlP - The indium gallium aluminum phosphide LEDs came out in the early 1990's. These are usually either red-orange with a dominant wavelength around 610-617 nm, or yellow or "amber" with a dominant wavelength around 590 nm. Dominant wavelength can be as low as the 550's of nm ("pure green" or "emerald green", yellowish green but less yellow than usual for LEDs) and as high as the low 630's (He-Ne laser red). The most efficient ones are usually orange to orange-red. Overall luminous efficacy for orange ones is usually around 7-15 lumens per watt but at least 17 to around 20 for Agilent's best variant that I know of. Orange-red ones are similarly efficient. Yellow ones are mostly a little less efficient, 4 to 13 lumens/watt. Green ones are less efficient still (up to about 4 lumens/watt) but more efficient than GaP and GaAlP green LEDs. With the exception of some more-red models, these LEDs have significantly reduced efficiency at low currents of a few mA or less.
AlInGaN LED's are violet, blue, green.
indium gallium nitride LEDs are mostly made by Nichia or Toyoda Gosei. Agilent / Hewlett Packard is also in this game. Cree makes similar LEDs. There are minor differences among the products of these manufacturers so that they don't infringe on each other's patents. Blue LEDs of these types typically have a dominant wavelength around 470 nm and a brillint blue color between pure blue and turquoise blue. Efficiency was about 4 lumens per watt at 20 mA in 1997 and has since improved to about 7 lumens/watt in 2000.
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