Step by step wiring:
1. Having attached all of the LEDs to the heatsink, making sure they are lined up with the positive ends facing the right direction - towards where the positive lead from the power will come, solder the LEDs into two series chains of 12 each, using short pieces of insulated wire. Connect negative end to next positive end, etc.
2. Attach IC Voltage Regulator, a tiny little thing, to the heatsink with a electrical isolation pad between it and the heatsink, and an electrical isolation bushing in the Voltage Regulator mounting hole.
3. Solder a 47 or 100 microfarad capacitor, preferably one that doesn't have a positive and negative lead, across the "Vout" and "Adj" terminals of the Voltage Regulator.
4. Select the current setting resistor, by dividing 1.25 by the desired current (twice the current per LED, since this will be for two parallel circuits.) Pick the closest standard resistor to the value you determined. Solder one lead from each resistor together, to put them in a series string.
5. Solder the connected ends to one end terminal of the DPDT switch (SPDT works fine).
6. Solder one of the remaining resistor leads to the other end terminal of the DPDT switch.
7. Solder the other remaining resistor lead to the "Adj" terminal of the voltage regulator.
8. Solder a wire connecting the center terminal of the DPDT switch to the "Vout" terminal of the voltage regulator.
9. The 48 volt DC power adapter has a row of pins at one end - 6 as I recall. Solder a wire from the second or third of those pins to the "Vin" terminal of the voltage regulator.
10. Solder two long lengths of wire together at one end, and solder that connected pair to the "Adj" terminal of the Voltage Regulator.
11. Solder the other end of one of those long wires to the first positive solder pad on the first in the string of LEDs. Solder the other end of the other long wire to the other first positive solder pad on the other string of LEDs.
12. Solder short wires to the negative solder pads of the two end LEDs in the two strings, and connect them to a grounding screw in the heat sink.
13. Solder a ground wire to the ground terminal of the 48 VDC power adapter, and attach the other end to a grounding screw on the heat sink.
14. Solder the green ground wire of the 120 VAC power cable to the ground terminal on the 48 VDC power adapter, or attach it to the grounding screw on the heat sink.
15. Connect the black and white wires of the 120 VAC power cable to the power in terminals on the 48 VDC power adapter.
16. Wiring is complete. Double check your fire insurance before plugging this in the first time
