The problem is LEDs also lose brightness.... I believe everyone would prefer if the LEDs they purchase were Cree LEDs. I believe they are the best or use to be?
But according to Cree's document.... L90 can be from 35,000 - 50,000 hours. L70 can be the same on the same LEDs 35,000 - 50,000 hours of use. Some around 15,000 hours for L90 and L70.... some more 60,000. If they are not using Cree probably less?
Basically 30% loss in 35,000 - 50,000 hours. Also the Jarvis SCRT-320 has a LED driver or power supply which is basically the same as a ballast. The LEDs have to have it for the light to work.