Arduino and N-Channel Mosfet: half on? [SOLVED]

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hi all. have question!

i attempting make simple driver 1w led, supposed flash (short arduino pin high).

anyway, hook led , mosfet in schematic:



the trouble led shining half brightness, , when trigger arduino pin shines @ full brightness. question is, why half-on? triple checked dgs pins , in correct place.
mosfet datasheet: http://www.seeedstudio.com/wiki/images/e/e7/0440200p1.pdf


thanks!

the schematic isn't :-)



this 1 project. can ignore parts on left side , imagine pin 3 of 74hct08 arduino-pin.


Arduino Forum > Using Arduino > General Electronics > Arduino and N-Channel Mosfet: half on? [SOLVED]


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