A right of light is an easement to enjoy the natural light that passes over someone else’s land and then enters your building.
Rights to light entitle the beneficiary to receive sufficient natural light from windows, skylights or glass roofs to allow the space behind to be used for its ordinary purpose.
The result is that rooms used for different purposes are entitled to receive different levels of light i.e. a greenhouse requires more light than a store room.
Consequently, it is not sufficient to show that there has been a net reduction in the amount of light available; the loss of light must amount to a nuisance.