Certain light spectra familiar in architectural lighting are suitable for the optimal illumination of green walls. In contrast to spectra for plant cultivation, the light for use in architectural lighting has a white light colour and thus also green components. In particular, the 3000K CRI 97 LED used by ERCO has very good colour rendering, which is particularly important for a natural perception of the leaf colour. This light spectrum is suitable for illuminating both architecture and green walls.
Balanced lighting keeps the plants in green walls healthy and also limits undesired excessive growth. The project planning should take into account the optimal effect in the interior space along with simultaneously low maintenance needs.
As plants in green walls mainly come from tropical regions, a lighting period of 12 hours is recommended for good plant growth. Depending on the spectrum, the required illuminance can be calculated for this time. Illuminance levels of 2500lx are common for green walls. Our white paper explains how to convert the quantity of light required by plants into illuminance. This allows you to plan the lighting of green walls with common lighting calculation programs.
With vertical green walls, make sure that the light is distributed uniformly so that the plants grow evenly. The wallwash distribution of ERCO lens wallwashers or the oval flood distribution of spotlights are particularly suitable. Conventional downlights or spotlights with narrow distribution are not recommended as they do not expose all plants to the same light conditions, with the result that they can grow differently or, in the worst cases, die.
Our white paper provides you with more detailed information on optimal lighting design for green walls.
Leave nothing to chance in your project, because the right light conditions are a prerequisite for healthy green walls and must be well planned. Find out the specific DLI value for the plants in your green wall and use this to determine the required illuminance. We explain all the technical terms and calculation steps in our white paper. You can use our Product Finder to select luminaires with suitable distribution and wattage.
In a light calculation program, construct a horizontal measuring surface at half the height of the green wall. Then tilt this measuring surface to take into account the alignment of the leaves. Align the measuring points with the centre of the luminaire's light emission surface, because leaves orient themselves towards maximum illuminance. To maximise the illuminance, select a higher wattage for the luminaires or reduce the luminaire spacing to obtain the target value.
In a light calculation program, construct a vertical calculation surface with a border area of 25cm in front of the front surface of the green wall. Then determine the vertical illuminance and calculate the uniformity from minimum to average illuminance. For uniform distribution of brightness, this value should be greater than or equal to 0.4. To optimise the uniformity, now check the light distribution. You can then increase the distance between the luminaire and the green wall or reduce the distance between the luminaires.
Qiguang Technology Co. Office, Shenzhen, Photography: Jackie Chan
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