There's a number of ways of doing this.
The easiest (if they've all got the same intensity setting) is to simply set this to 0% where needed (you can use the spreadsheet editor for this).
Another way is to toggle the Affect Diffuse, Affect Specular and Affect Caustics settings for each light (again, see if you can use the spreadsheet to do them all at once).
Or, you can stop them affecting an individual object by toggling them off in the objects Properties/Lights panel.
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