Seven years ago I bought a large quantity of the 3W cool white LEDs on a star heatsink and all of them had a cool white light output. But then in replacing a few of these LEDs purchased seven years ago with the same LED from the same vendor purchased about 2 years ago, the replacement LEDs have a yellowish output. Has anyone else experienced this? If the unlighted LED has a yellowish appearance, does that mean that when powered that it will produce a yellowish output? How can I avoid purchasing a LED described as producing a cool white illumination but in reality it has a yellowish tinge to its light output?
The LEDs that I purchased seven years ago that have not failed (most of them) continue to produce cool white light.
The LEDs that I purchased seven years ago that have not failed (most of them) continue to produce cool white light.