leds of different colors

led leds light-emitting-diode diodes semiconductor-lighting-component led-equipments infrared-led diode anode cathode semiconductor electronics optical-communication low-energy-consumption electronic-component blue gray dc engineering diy aviation-lighting emits-light dimming electrons component energy flashing green hyaloid infrared lab led-lamp luminescence optoelectronic parts photodiode physical-science red silicon technical-works transducer transparent ultraviolet yellow background beam emitting group