How-to reduce the amount of unused light
Part-night switching or dimming is an energy-efficient and money-saving option that should definitely be considered during the design stage. For example, if an area is unused after a certain time every night, is there any need for the same lighting levels required as at peak times?
Anti-glare light shields minimise unwanted light spill and put light where you need it. They are another simple consideration for the design stage of your project – but can also be retrofitted to a scheme already installed. Shields can be discreet, so there’s no need to worry about ugly lighting.
Finally, consider appropriate mounting heights and inclinations of the luminaires. Generally speaking, a higher mounting height or an increase in the tilt angle could generate more spill light than one mounted lower with a zero-degree uplift. Floodlights are one of the biggest contributors to unwanted spill light when positioned incorrectly.