[jeffkrol]

For those DIY'ers or even commercial buyers be aware of a possible trend in the LED industry of "mimicking" Cyan LED's
Up until now most were the larger LED's and clearly labelled:

10W 900LM Cyan 490nm LED Light 4PCS Green 520nm+5PCS Royal Blue 455nm 9-11V

As the following 2 charts demonstrate:
A 3W "cyan" LED advertised for sale:

A "true" cyan LED:

 

[Edub]

Is this only a problem with off brand or fleabay LEDs or are the major brands and retailers affected too?

 

[jeffkrol]

Is this only a problem with off brand or fleabay LEDs or are the major brands and retailers affected too?

The 3w was from a retailer, I erased their name from the chart.... the "Quote" was from fleabay.. MOST of what I've seen on fleabay does note the dual B/Y Led, some listing it as "effective cyan"..
The 3W made no reference besides the tell tale emission spectra..

IF China decides to eliminate all true cyan and go w/ dual LED on die it will get harder and harder to be sure.. As a note, when I saw this was happening I ordered my last cyan's from StevesLED's..

Currently not much to worry about w/ "name brands" AFAICT but who knows..

The only way to assure "purity" is to make sure people don't buy the "hybrids"....

Currently fleabay has VERY little in cyan.. This one (and the only one selling 3W cyan, unlike the hundreds selling other colors) seems legit IF they are telling the truth:

Quantity: 10pcs
Star Size: 20mm
Emitted Color: Cyan
Wavelength: 490~495nm
DC Forward Voltage (VF): 3.2-3.4V
DC Forward Current (IF): 350mA -700mA
Power: 3W
Package Include:
10pcs 3W 490nm

Fake one in comparison:

Cyan LED 3W
Aquamarine Cyan LED 3W

Wavelength: 490-520nm
Forward voltage: 3.8V @700mA, 3.5V @500mA, 3.2V @350mA
Efficiency: 30 lm/W
Max. current: 700mA
Beam angle: 120-140 degree
Operational temperature: -20C ~ +70C