Modifying intensity of instance lights

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I have a template light instanced to points on a grid.

I want to modify the intensity of the instanced lights. As an example, I'd like to multiply the instanced point number by sin, and then fit that value within a range of 1-15.

Any help much appreciated.
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Would be great if anyone can help with this.
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http://www.sidefx.com/docs/houdini/render/instancinglights.html#varying-light-parameters-across-instances [www.sidefx.com]
Tomas Slancik
FX Supervisor
Method Studios, NY
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