How to power 9- 1w LEDs with separate control?

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hello, want separately control 9-1 watt leds through 9 of digital pins on arduino, planned on using logic level mosfets need some
more info i'm rather new arduino , figured out code side need figure out how power them
, curious kind of resistors need , if need 9 separate mosfets or if need 9 drivers if want run them parallel? powered 12vsupply
they 3.5 v 3.7 v leds 350ma
any appreciated!

about resistors:
you need 1k on every mosfet gate (especially pwm mode) , load on led need resistor of
(12 - 3.7) / 0.350 = 23 ohms
of power (12 - 3.7) * 0.350 = 3 watt (better more :) )

about mosfets:
you can use to220 n-channel mosfet, read datasheet , graph lines, 1 every voltage on gate (vgs) (it's first graph), may need heatsink if use pwm

about connection:
if connect them in groups it's better connect them in series, cannot connect more 2 on every channel, in case need smaller resistor (subtract 3.7v on formulas)

about power supply: :)
are sure can handle 4 amperes of power?


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