So, I started using LEDs on my planted aquarium about 4 years ago. What is the latest thinking on how long LEDs last, whether their output falls off over time, and whether the light spectrum changes over time? I have seen estimates of light life ranging from 10,000 hours to 50,000 hours. That is a big range. None of the diodes have gone dark, and everything seems happy, but I haven't measured the light output or whether the spectrum is the same as when I purchased (from the old BuildMyLED.com - now out of business). Any ideas out there?