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Power supplies, boost-buck, inverters, transformers, etc. are AC-DC, DC-DC, AC-AC, DC-AC converters. They come rated at the output so it is a 12V source. The only COBs I know are the Chinese chips like this Cree also have 12V chips like XHP50-70 , they come in smd format but you can find...

1200W/100A=12V 12v COBs normally are rated at 10W max, you can drive them at 350-700mA. How many you can drive depends on the Current they draw at 12V so you can connect from 1 COB up to (100A/forward current at 12V.)

To dim 3 drivers you need a 33k ohm pot, for 2 drivers a 50k ohm pot, linear potentiometers

You can't connect 4 Qb288 to a 36V power supply, they work at 54V(some Chinese QB288s works at 48V), with Qb132s there is no problem, but when you work with constant Voltage you need to limit the current. Increasing the Voltage more current will pass through the boards. LRS series comes with a...

Those drivers can handle 2, 3 or 4 36V class Cobs in series. If you connected 1 COB, it is not to much Amps, it is too much Voltage(71V). With a DMM measure the open Voltage to check if the driver is providing the correct one(146V). Check that COBs are placed with the right polarity in the...

By the way, it would have been better to choose the 42A model

I guess you bought the L09, you have to wire them in parallel, around 28w each, U channel aluminum must be enough to dissipate it.