I think this will work.
Photo transistor
http://www.mouser.com/ds/2/427/bpw96-222639.pdf
LM339N
http://www.mouser.com/ds/2/149/LM339-186212.pdf
50K pot 3362P-1-503LF
http://www.mouser.com/ds/2/54/3362-55248.pdf
Fet NTD4906N-35G
http://www.mouser.com/ds/2/308/NTD4906N-D-97762.pdf
Edit:
add schematic.
I think the led strips come with built in resistors.
Yes, the resistors are installed on the LED strip. They are 12 V ready.
Thanks , much clearer to understand when actual components are actually listed from the Mouser website. And much easier to put a parts list together, since I don't know enough about this to pick what I need.
On the "LM339N". Do I need one with "Open Collector, Open Drain or just Open Drain". Does it matter?
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