Aloha Knna,

Beeg mahalo fo' all dem fish.

Just a quick FYI.
The LM317 maxes at 1.5 Amps.
And they need about a 2.5V drop.
Not all that bad for 24 -36V strings.
So, 2.5W wasted as heat. and only half of it is regulator heat.
(1.25V X 1 amp in sense resistor)
Got some running @ 50 C. @ 1 amp with a 2" sq 1/2" high finned 'sink, no fan.
That help, R. L.?

ciao
Weeze