MR
sorry, but you are adrift
your 350W psu that will run flat out, dropping the 'excess' on a 'dropping resistor' will create ~500W from the psu + ~250W 'excess' that you will be dumping; thats 750W continous being dumped into your 'lab'
go get a 750W heater and run it in your lab,
but wait - there is more
you still have to dump the 100W in your coolant, how is that going to happen ?
to air ? -> got a constant temp air source ? (not if you're putting 850W into it, rest assured)
back up, get a feel for what your SYSTEM must do
that will give you an insight into HOW to do it
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