I'm hoping this is a basic question for someone.
I'm planning to build a light using an AC adapter as my DC source. I want to hook it up to a buckpuck (led driver to supply the correct current) which will then drive the LEDs. I can run them all at 700mA forward current but the problem I have is there are multiple forward voltages. Some are 2.35 and some are 3.5. I had the idea to use multiple Buckpucks but then I wasn't sure if the AC adapter was powerful enough.
If I hook up 1 LED then it draws 700mA and 3.5V. So my source has to also provide at least 700mA? If I hook 3 of them in series I know that the forward current is still 700mA for all 3 but the voltage is multiplied; 3.5*3=10.5V. If I add a second string of 3 I know I still only need 10.5V to drive all 6 but how much current is needed? is it still 700mA. Take this to the next step and drive two buckpucks with a 12V AC adapter. Is 12V/750mA/15W enough to drive say 2 series of 3 leds on each Buckpuck? What is the math you use to figure all that out?
I'm planning to build a light using an AC adapter as my DC source. I want to hook it up to a buckpuck (led driver to supply the correct current) which will then drive the LEDs. I can run them all at 700mA forward current but the problem I have is there are multiple forward voltages. Some are 2.35 and some are 3.5. I had the idea to use multiple Buckpucks but then I wasn't sure if the AC adapter was powerful enough.
If I hook up 1 LED then it draws 700mA and 3.5V. So my source has to also provide at least 700mA? If I hook 3 of them in series I know that the forward current is still 700mA for all 3 but the voltage is multiplied; 3.5*3=10.5V. If I add a second string of 3 I know I still only need 10.5V to drive all 6 but how much current is needed? is it still 700mA. Take this to the next step and drive two buckpucks with a 12V AC adapter. Is 12V/750mA/15W enough to drive say 2 series of 3 leds on each Buckpuck? What is the math you use to figure all that out?