'Redline's LED - DiY - Build' aka"GROW LIGHT"

[Weezard]

I went to order some LM317's and I found all different knids. they have lm317T, AT, A, AEMP, AEMPX, etc. is there a difference in how they work or just the design. Also, what gauge wire should I use to wire 3w LEDs.
thanks

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W.