Hi,
Have been using some small lengths , 30cm, of the waterproof silicone covered 5050 blue leds strip lights in a well protected aquarium hood.
They are secured by their self adhesive to an alum backplate to help dissipate the heat and used along side some compact tubes.
Their light output is initially good but after a month or two the output reduces to about 30% but the voltage and current remain constant at 11.19v and 130ma.
Even removed from the alum backplate they remain dim and at the same current, so dispelling the idea of any shorting on the backplate.
Have tried 2 different makes of these 5050 blue leds both with similar loss of intensity over a couple of months
Bit puzzled as to why ? could the heat from the nearby compact tubes be affecting them so dramatically; though no signs of any burning ?
They are run by a 1000hz pwm /power darlington to give a slow start up and shut down and on approx 12 hours a day.
Any thoughts welcome....
Have been using some small lengths , 30cm, of the waterproof silicone covered 5050 blue leds strip lights in a well protected aquarium hood.
They are secured by their self adhesive to an alum backplate to help dissipate the heat and used along side some compact tubes.
Their light output is initially good but after a month or two the output reduces to about 30% but the voltage and current remain constant at 11.19v and 130ma.
Even removed from the alum backplate they remain dim and at the same current, so dispelling the idea of any shorting on the backplate.
Have tried 2 different makes of these 5050 blue leds both with similar loss of intensity over a couple of months
Bit puzzled as to why ? could the heat from the nearby compact tubes be affecting them so dramatically; though no signs of any burning ?
They are run by a 1000hz pwm /power darlington to give a slow start up and shut down and on approx 12 hours a day.
Any thoughts welcome....