Does anybody know if you can disable the led in a zalman HSFs?

sure you can, just look for the wire on the fan that goes to the led and snip it.
 
sure you can, just look for the wire on the fan that goes to the led and snip it.

Looking at my 9700 (Gunmetal with Green LED version) It looks like the LED(s) are under the fan's hub. So you're right if you want to take the fan apart.
 
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