cfz2882
Well-known member
LEDs dimming with long term use
I too have noticed LEDs dim some over very long usage-discovered this with a GE green LED alarm clock I got new in 1980;when I first got the clock it would light up a dark room and the transformer area would get warm when brightness turned all the way up-after a few years,display had dimmed noticeably and transformer no longer would get warm at full brightness-indicating the aged LEDs were pulling less current than they did when new-interesting...The clock is still in use and no further dimming has been noticed for the last ~30 years.I have an outdoor LED that has been on over 3 years and I might compare that one to an unused same type one bought at same time to see if any dimming noticed.With the low pressure sodium fixture,the color changes over long warmup process is kinda cool to watch-mostly red/orange with a little purple,then the yellow starts to appear as lamp warms.
I too have noticed LEDs dim some over very long usage-discovered this with a GE green LED alarm clock I got new in 1980;when I first got the clock it would light up a dark room and the transformer area would get warm when brightness turned all the way up-after a few years,display had dimmed noticeably and transformer no longer would get warm at full brightness-indicating the aged LEDs were pulling less current than they did when new-interesting...The clock is still in use and no further dimming has been noticed for the last ~30 years.I have an outdoor LED that has been on over 3 years and I might compare that one to an unused same type one bought at same time to see if any dimming noticed.With the low pressure sodium fixture,the color changes over long warmup process is kinda cool to watch-mostly red/orange with a little purple,then the yellow starts to appear as lamp warms.