Hello
why are you still thinking the LED clusters lost PAR?
Did you do another meaurement in the past under the exact same conditions? What were the results then?
You are writing about a measurement you recently did but where is the measurement you are comparing with?
I think we only can talk about a reduced brightness if there where several mesuremens under the exact same conditions:
- measurement in air, not in water to exclude influence of ingredients
- same brightness of all LED channels
- same energy options
- all simulatons shut off (moon, acclimation cloudes, etc.)
- same environment and lamp temperature
- exact same distance of PAR-meter, exact parallel alignment of meter and lamp
- in dark room
the same things I already wrote you by email this weekend.
If we have these measurement we can judge if there is an abnormal reduction of light power. But I doubt that there will.
Lifespan for the LED is >50000h at 85°C at full power. Since we have never 85°C and rarely full power a much longer lifetime can be expected.
In the first year you loose about 1...3%, after 10 years about 30%.
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