Luxeon Rebel 145 lumens output

[bascerballer4]

You still dont make sense. Why would all of a sudden I need a 2v extra to my power supply now? Before you said 1.25v, now its 2v? Can you please explain and show how you got these constants? Not to be offensive but anyone can write down any number and say its correct, if they don't show evidence of how they got it. And also you are way too confusing. All I just want to know is where did the 1.25v come from?

TorchBoy- "FWIW 16V - 2V - 1.25V = 12.75V. So across each LED there will be 3.1875V. So you'll get about 350mA according to the Rebel spec sheet.

However, using a simple 2.2 ohm resistor gives... 700mA (roughly). No LM317 required, no heatsink on the LM317 required. Constant current, and the amount of current you want."

I dont understand why you would minus the 1.25V from the power supply. It would help if you clear this matter up so it wouldn't be too confusing for other people who are reading this thread.

 

[TorchBoy]

2V is the dropout voltage of the LM317 at about 700mA, which is what we've just been discussing. Do you understand what that is?

I said in my last post that you don't need to take the 1.25V off the supply voltage. You did read that, right? (Or perhaps you took 26 minutes to type (then edit) your latest post.)

 

[bascerballer4]

Not to be offensive again but most of the time I don't understand what you are saying and trying to get at because you are very confusing. I edit my posts because I catch the mistakes I make.

It would clarify it a lot if you would just say what I wanted to know. I wanted to know the power supply needed. By saying "Your total power supply would need to be 18volts. 16volts for 16 LEDs plus 2volts for the LM317T, a total of 18volts for your power supply," instead of mentioning about my mistakes which doesn't really matter because I caught them myself, just haven't edit them yet. You do not need talk in a offending way and give direct criticism when I don't need them because it gets really confusing and very ugly. It's easier to just give help instead of criticism.