There are multiple definitions - click on the translation that matches your context.
right to light means:
főnév
partial
noun
1. A right the rules of which have been established through judicial practice. 2. According to the Hungarian Civil Code, when using his property, the owner must refrain from engaging in any conduct that would needlessly disturb others, especially his neighbours, or that would jeopardise the exercise of their rights.
the right of the owner of a building to challenge the building of any structure that would block their natural light
Owners of nearby properties with a "right to light" could be given compensation and be made to sign an agreement that stops them taking the council to court over any loss of light.