Another resistor was needed on the MOSFET GATE, as it shows in the schematic, but I still think the power is not 100% even with this 10k resistor. I will make some tests again, and also connect the strip directly to the source, to see again the full power. Anyway, now it lights up more than it was before, without that transistor
UPDATE. It's not 100% but it's quite close, maybe it's at 90%. Tomorrow I will check the code on the arduino . The mosfet and transistor are cold, not even warm 