The cyan Luxeon 5W emits a high number of Lumen and can be used just with special Soundboards/Luxeon controllers because of the high consumption. To get a good colour you have to win the lottery, because you have no influence on the Bin-code (describes the composition of the gases inside the LED) and in an cyan LED it can differ much. Either you get a LED, which is more green or one, which is more blue or something in between..