I'm making an edge-lit snowflake out of acrylic. It's lit from the center; the LEDs are mounted straddling a circular (40 mm diameter) PCB.
I'm using 24 white LEDs, and since I don't want to work with huge voltages, my plan is to divide them into four 6-LED circuits, driven by a constant current source from 24 V, 20-30 mA, depending on how the thing will look like when fully it.
My original plan was to use through-hole LM317s, but now that I'm laying out the PCB, I've been tempted to use surface mount parts to keep the front-facing side nice and spotless. So far I've been able to find LM317 in SOIC-8 and SO-223, and it's a bit of a tight fit with those. I'm soldering with an iron so I'd like to keep the design as roomy as possible.
Are there smaller adjustable regulators or constant current designs (e.g. SOT-23) that would fit better?