Here's the pic of the driver I'm using w/LDO:
C1 and C2 are both 10 uF -- think this was proper way to do the LDO?? I'm 99% sure this is the LDO that is "DEL recommended" 
, I hope?? Pretty sure I got these LDO's from Arrow, after you or HQ gave me the exact part#, I believe - at first I bought the wrong ones. Arrow's order history is broken so I can't confirm right now - I'm at work so don't have access to the LDO parts. Dunno if that "L250" label on the LDO means anything. Hhmmm - ok, was discussed in HQ's thread here: https://budgetlightforum.com/t/-/40540.
I know I did not guess in choosing the LDO myself - used one previously posted/used or recommended. I do not trust my own knowledge of this stuff at all.
Edit: Ok, found the LDO I'm using: https://www.arrow.com/en/products/mic5235-5.0ym5-tr/microchip-technology, Microchip, 5V output.
I thought I was told using a 10 uF cap for C2 would be the way to go with an LDO. Is this correct? I see the circuit in the data sheet is fairly complicated w/parts.