Do you know how to update this data in a sh3f file ?

Sorry if I was unclear. There is no power setting in .sh3f/PluginFurnitureCatalog.properties (only in .sh3d/Home.xml). In .sh3f/PluginFurnitureCatalog.properties you can use the html (six digit hex) colour notation:

a very bright white light would be:

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 lightSourceColor#xxx=#FFFFFF

a 'normal sh3d white' lightsource is (if I remember):

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 lightSourceColor#xxx=#BBBBBB

a much less bright 'white' light would be:

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 lightSourceColor#xxx=#222222

ok