rainbow effect at edges

hi all,

I've finished my PJ this week ,but i've got a little problem with rainbow effect at edges .Not at all but only in those 2 which are near to lamp.I have vertical design with 3pc 80mm fans with 30 cfm mounted at the bottom .Is this problem of cooling ,fresnel position or i damaged my lcd ? :(

thanks
 
rainbow attachment

here is foto
 

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