I do not agree with the test result.
I have being using LED aquarium light since solaris time.
During that time there is very little choice and is expensive.
The leds are all running near to peak allowable and the
life is short
Today with the price of LED dropping and performance greatly
improve .Choices are many.
The prices you paid some come is in relation to the component
quality ,design ,material quality and service quality.
LED as we know come in many different bin.
The more tolerance tight bin is going to cost you more.
And I mean a drastic different in cost
That is where the price different fall .
But on the whole most of the led Light set today have rather
acceptable quality.
So the drastic drop off from original spectrum in a short time
is not possible.Although there are drop off.
Today the weakest link in any LED light is the power supply.
Most of the time they are the culpit and upon changing a new unit
every thing is back to normal.
Hope this explain why I do not believe in the test result publish