B757 FLT CREW IS ISSUED AN MEL BY MAINT CTL FOR AN INOP FIRE WARNING INDICATOR LIGHT. THE IMPROPER MEL IS ISSUED.

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CALLED JUST BEFORE DEP TO RPT THAT DURING THE PREFLT FIRE WARNING TEST THE WARNING LIGHT IN THE R ENG FUEL CUT-OFF SWITCH WOULD NOT TEST. ALL OTHER SYS TEST INDICATIONS WERE NORMAL FOR BOTH ENGS; THE APU; CARGO FIRE AND WHEEL WELL FIRE. AS I RECALL THE LIGHT WORKED NORMALLY DURING THE FLT DECK 'LIGHTS' TEST; AS RPTED BY THE CREW. REALIZING THAT THIS WAS AN UNUSUAL PROB WHICH WOULD LIKELY ENCOUNTER A SIGNIFICANT DELAY; I LOOKED INTO MEL 26-11-01. AT THE TIME I DECIDED THAT THIS MEL WAS MORE RESTRICTIVE THAN NECESSARY AND WAS THUS SAFE TO USE. IT WASN'T UNTIL THE NEXT DAY THAT I REALIZED THAT WHEN I USED THIS MEL I WAS CONSIDERING THE AFFECTED ENG SIDE INSTEAD OF AN AFFECTED LOOP. (MEL 26-11-01 ADDRESSES SPECIFIC LOOPS INOP; NOT ENGS AFFECTED.) I INCORRECTLY ISSUED A FLT CREW PLACARD TO DEFER THE ITEM. THE NEXT DAY; WHEN I REALIZED WHAT I HAD DONE INCORRECTLY; THE ACFT WAS STOPPED UNTIL FIXED. SUPPLEMENTAL INFO FROM ACN 689688: DURING PREFLT; FIRST FLT OF THE DAY ITEMS; FIRE WARNING CHK; I DISCOVERED THE R FUEL CTL SWITCH LIGHT WAS INOP. I CALLED MAINT AND TOLD THEM EXACTLY WHAT I HAD AS A DISCREPANCY. THEY GAVE ME AN MEL NUMBER AND A CTL NUMBER AND INSTRUCTED ME TO FLT CREW PLACARD IT.