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1200mA is the max continuous allowed current from the power supply. It has nothing to do with this circuit that will draw a max current of only 150mA.The PSU I was going to purchase is 9v, 12v, 15v & 18V (switchable) 1200mA.
Would it be necessary to change R1 because it is 1200mA?
The difference in brightness will be small.Would I expect to see a difference in brightness between 12v and 15v PSU? (12v ones are much cheaper)