Driving camera LEDs with MOSFET through PWM

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hi everybody,

this first post on arduino forum ...
hope question make sense , find many answers  :)

i need fade 4 leds of usb camera i'm using 1 of arduino nano pins output pwm on wire handling leds.
this working pretty except when duty cycle around 100% output voltage reaches 4v since guess board can't supply more 40ma.
i think idea used mosfet there triggered pwm.
however don't have slightest idea of kind of mosfet shoud use , schematics.

as leds embedded in camera don't know maximum required current suppose 100ma enough ...

any proposals mosfet type , schematics?

thanks in advance

at 9 cents pop, 1 should have 2n7000's lying around.

http://www.taydaelectronics.com/t-transistors/2n-series/2n7000-mosfet-n-channel-60v-0-2a.html


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