Ok.
1200W and 120 volts, that means 10 amps max.
You're shooting for 350 Watts.
Using:
P = V * I
and V = R * I
we get P = R * I * I (or P = R * I^2)
P=1200
I=10
so R is going to be 12 Ohm.
using:
P=350
and R=12
we get 5.4 amps.
The voltage would be 65 VDC.
If you could find a heater that would be less resistive, you could lower that voltage.
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