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When LEDs generate heat, the junction voltage decreases which increases the current. So Did you include a constant current source on your design to make your LEDs last longer?
I have a project where I need to use LEDs, I need to achieve 960 lumens at 50% duty cycle and I do not know how I can achieve that using LEDs, if anyone has an idea please help. Refer me to a trusted source or please email me firstname.lastname@example.org, your assistance will be very much appreciated