Hi, I am fairly new to the LED lightning concepts. Although I do understand the basic constraints and how to drive LEDs. I am trying to build a LED based flood light. I am using around 120 white 5mm good quality LEDs. I have used series and parallal combination to design my cluster and to operate it at 12V.
However I am facing problems during testing. According to the LED manufacturer the LEDs should last for 50,000 hours but in my case, the LEDs start flickering and a few have also burnt out after only a few days operation. The light intensity also decreased considerably after only 48 hours of operation.
I am using current limiting resistors and am driving the LEDs at 20 mA as mentioned by the manufacturer as optimum current. I am using a 12V 2A DC Voltage supply. I have got some information that I have to drive LEDs with a current controlled driver. These drivers are fairly expansive and there are ICs that can drive around 4LEDs and that solution is also very expansive.
Can anyone give me any suggestions or solutions to help me with this design? I' ll be grateful.
However I am facing problems during testing. According to the LED manufacturer the LEDs should last for 50,000 hours but in my case, the LEDs start flickering and a few have also burnt out after only a few days operation. The light intensity also decreased considerably after only 48 hours of operation.
I am using current limiting resistors and am driving the LEDs at 20 mA as mentioned by the manufacturer as optimum current. I am using a 12V 2A DC Voltage supply. I have got some information that I have to drive LEDs with a current controlled driver. These drivers are fairly expansive and there are ICs that can drive around 4LEDs and that solution is also very expansive.
Can anyone give me any suggestions or solutions to help me with this design? I' ll be grateful.