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check lumo/luxi and apps that work with them. i think there is an app called Cine(something) that is able to tell the color temperature (ios8), but dont know how accurate it is.

Luxi is the cheaper one for the light metering, lumo is quite pricey...

edit. it is called 'cine meter II'
www.adamwilt.com/cinemeterii/colormetering.html and quite pricey app aswell...

before buying, better to check reviews or check related threads on dpreview.
 
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