These are chemical symbols used for materials used in the manufacturing process of the LEDs to generate specific colors.
AlGaAs - Aluminium Gallium Arsenide used to generate red and amber portions of the visible spectrum.
AlInGap - preferred chip technology using Aluminium, Indium, Gallium and phosphorous to produce red, orange and amber colors.
InGaN - Indium, Gallium and Nitrogen to produce green, blue and white colors.
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