Thank you for the reply Weezard. I've actually already read through that thread. And it is very informative. But it shares problems that almost all threads on the subject share. The information is to spread out(not huge but still problematic for beginners) and it's to complicated for beginners. For instance.

A sense resisror is so called because it hooks to the sense input of a regulator.

Here's how the LM317 CCR circuit works;

The lm317 is designed to be a variable voltage regulator
and it "wants to see" 1.25Vdc between the output pin and the ADJ/Sense pin. before it will begin regulating anything.
We take advantage of those facts for our current regulator.
We tie a restor to the output pin and draw the current to our load through that resistor.
If we run a wire from the load side of the resistor to the adjust pin, that pin will sense the voltage drop across the resistor.
So, ohm's law.
If we want a 1 ampere current limit, we use a resistor value that will drop 1.25V at 1 amp.
Once the adjust pin senses 1.25v.it regulates voltage to keep that voltage drop, and thus the current, constant.
1 A. X 1.25 V. = 1.25 W.
While a 2 watt resistor would suffice, a 5 or 10 watt resistor will run cooler and thus regulate tighter.
I had some 10 Watt, 1 ohm power resistors laying around so I thermal glued them to the heatsink.
Overkill? Perhaps,. But overkill is a good thing in this case .
Gives me about 1.2A. which is exactly what I wanted.
Seems to be the sweet spot in photons per watt.

What is this R2 you speak of?
The current limit configuration only requires one resistor.
And then you end with.

It's very simple.

Hehe. It probably is very simple in the context of building an LED Grow Light. But separated from allot of other facts and all out on it's own it's complicated to the beginner. Or at least it's complicated to me. I didn't understand most of it and what I did understand was just stand alone information. I don't know how to apply it properly.

That's why I think a full guide would be very helpful. I will reread that thread and try and digest some more information. Thank you for bringing it back up.

I will tread lightly on posting to much more about this subject in this thread unless you guys want to steer the discussion in that direction.

Thanks for the help.