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I have a friend who runs his 2-3 year old Gen 4s had like 11% less par than a brand new unit that he just got... so he runs two at 100% and one at 89% with the same PAR. This could be a manufacturing anomaly, but the difference is real... I went and tested it too with my PAR meter.
It appears that 5 years is safe with diode burnout, board issues and power supply problems, which appear to be more of a problem than PAR loss.
All I know is that the radions can likely go around 10 years at max intensity before a drop off occurs in most conditions.
I do not have anything on paper other than a picture of my new 310 with corals and lighting from my 180 and my 300DD before that. This 310 (96" x 30" x 25" tall is lit by 4 6' BML leds with the oldest purchased in 2012, the second 2013 and last two 2016. All still run at 80%. The leds are positioned over the corals with a Par average of 100+ to 250. I am in the middle of adding a lighting rack that will add 6 AI leds to the BML's which the oldest is 6 years old from a friend who just bought new Radion fixtures. Is it a gamble, yes but for the price I think it's worth it. I will post pictures and Par levels after the first of the year. The electrical company I work for is installing lighting from Phillips that comes with a manufactures warranty of ten years, so evidently they feel LEDs can now hold up. My first Led site lighting project Cooper lighting replaced $100,000 worth of pole lights on a project.
Oh yea I always forget the golden rule about cleaning the glass before taking pictures
Only applies to whites which most seem to run pretty low. So not too concerning AFAICT.I'm less concerned with PAR and more concerned with spectrum shifts due to the phosphors degrading.
Cool good to knowLifespan is fixture/enviroment dependent....
The diodes themselves can push >50000 hours (11 years 12hrs per day) w/ less than 20% loss but the measurement is err impractical..
Sounds like the same concerns I encountered when I ran my Metal Halide lamps from 18 to 24 months while changing them only after a 10% loss in Par. And yet my corals grow just fine. First with Metal Halide and now with Led. Although don't tell the led users MH grew them faster, I just got tired of the big bulky pendants on top of my tank.I'm less concerned with PAR and more concerned with spectrum shifts due to the phosphors degrading.
Did you use the same "PAR"? and at least close spectrums?Sounds like the same concerns I encountered when I ran my Metal Halide lamps from 18 to 24 months while changing them only after a 10% loss in Par. And yet my corals grow just fine. First with Metal Halide and now with Led. Although don't tell the led users MH grew them faster, I just got tired of the big bulky pendants on top of my tank.