I bought (5 ) 3-watt LEDs from Spark Fun that was cool white, part number com. 13105. This LED gives off a yellowish light and has a wavelength of 6,000 to 7,000 I don’t understand why it gives of yellowish light when it is supposed to give off white light . The color of the light is suppose to be like a fluorescent white, not an incandescent yellow.
Can you take a photo of the bag they came in (label)?
We’re going to take a look at stock and see ensure it’s correct; it sounds like you might have https://www.sparkfun.com/products/13104 in-hand…we’ll get ya fixed up
Thank you for your concern with my Forum post. I have included a picture of the LED in question and the bag they came in.
Hi!
Hmm, I briefly checked our stock today and that label matches what is in the bin for [COM-13105. I didn’t have the correct cable to test with the PicoBuck but using some jumper wires, the dim light appeared to be cool white from one of the LEDs that I tested.
I assume that you are using a constant current driver like the [FemtoBuck or [PicoBuck? Was it only 1 out of 5 that was not lighting up like the others (i.e. giving off the yellow-ish light?).
Let me get back to soon after I test it again with the correct cable and compare it with the one with the warm white to see what is going on.](https://www.sparkfun.com/products/13705)](https://www.sparkfun.com/products/13716)](https://www.sparkfun.com/products/13105)
Maybe try to take a photo of them turned on; our stock appears correct (cool white is barely bluish, warm is yellowy) and the bag appears correct for Cool White
I just had some time to test. It looks like the 3W LEDs are showing the expected color temperatures. Each LED in the bag should have the same LED die color.
The warm white had more of a yellow-ish color.
The cool white had more of a daylight, white color.
I tested the other ( 4 ) 3-watt LED’s . By themselves they do appear to be white because they are cool white. I think what happened was that the other 3-watt LED’s I was comparing them to gave off even whiter light than the Spark Fun cool white ones. I did not realize this at first and I do appreciate your help in solving this problem.