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[Phil]

Just to clarify putting anything on the inner face of the glass will cause heat build up within the double glazed unit.

Be it stick on film, blinds or fully boarded.

In the unlikely event you have toughened units it might be ok, but generally all roof lights have at least one side of the DG unit laminate float glass (to stop people falling through it or if it shatters falling on someone) so chances are it will break due to thermal build up

Look for the kite mark on the DG unit, no kite mark then plain float glass