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Thank you Keith, I see the bottom drawing also uses XPG3 LED's. There are a lot of options, each with its pro's and con's. I am looking to build PWM circuits that could be optionally connected to the Driver during experimentation. The default operating current will be 1050mA from driver, a...

Hi Keith Quote:"You are really going to cheap-out on everything after dropping more the four hundred dollars on those LEDs? Exactly why?" Perhaps! My plan was/is to use 9 Mean Well LDD Step Down Converters and a 48v Power Supply. 1 LDD per string of 12 LED's. It was suggested I should use...

Power Supply: Gophertc CPS-6011 60V 11A Adjustable C/V. LED’s: 108x Cree XP-G3 LED Configuration: 6x 18 LEDs in Series. XP-G3 LED's = (2.74 Vf 150mA @25C) - (3.11 Vf 2000mA @25C) Voltage Range = 49.32 to 55.98v 49.32v + .2 Transistor drop = 49.52v BD139 Transistors have Maximum...