did you measure how much current each LED was drawing?
LED lifespan is rated at a specific current draw. I've always run LEDs at 80% of their rating or less to get the maximum life from them. Once you exceed their current rating by even a tiny amount, the lifespan drops fast. And yes, the color shifts as they burn out. This problem gets even worse if the heatsink is inadequate or poor thermal paste/pad, etc.
Was this a pre-made unit or diy?
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