Host is a S4 with a copper HS upgrade bought from SL
Diode is a 445nm M140 purchased from DTR
Driver(s) are 1.25a and 1.8a 16.8mm circular buck drivers from SL **NOTE**- if using a buck driver with this build, you will need two 3.7a batteries (rcr123 or 16430) inline. One single 3.7a 18650 will...