Owlet Nightshift Benefits: Energy savings

Bild 10Constant Lumen Output – Energy savings 8%-10%

To ensure that the required illuminance is provided over a period of time, the lighting design includes a maintenance factor MF that takes into account the reduction of luminous flux. A typical maintenance factor is 0.8, which indicates that the light output of 100% will depreciate to 80% at the end of the service time. Lighting consultants must budget in the fact: newly installed lamps emit more light than necessary, ensuring that lighting levels at the next service cycle do not fall below the required minimal level.

The Constant Lumen Output (CPO) function compensates the deprecation of light output of the installation and eliminates over-lighting. Depending on the installation, energy savings between 8% and 10% are very likely to achieve.

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Bild 11Virtual Power Output – Energy savings 0%-25%

Like all lamps, lamps used in outdoor lighting are available in a range of fixed wattages (i.e. 50W, 70W, 100W, 150W, 250W, etc. for high pressure sodium lamps).

During the design phase of a street lighting the required lighting level, light pole spacing and the illuminance uniformity ratio are determining factors of the lamp power needed, resulting in a needed lamp wattage that might not exist. In today’s designs the lighting engineer will choose the next higher available lamp wattage, which leads to over-lighting the installation.

With Owlet Nightshift’s VPO you can compensate this effect, dimming i.e.you can set a 150W lamp to the initial 120W design value, avoiding over-lighting and wasting energy. With the build-in VPO functionality energy savings up to 25% are feasible.

Bild 12Selective Dynamic Lumen Output – Energy savings 30%-40%

Wouldn´t it be nice if the lighting level could be adjusted in relation to traffic density? With Owlet nightshift you can define dimming profiles to save energy during low traffic hours late night and have the right lighting level when the rush-hour begins.

Using the SDLO-Function can help to save energy between 30% and 40%.