The plants are illuminated from above similar to sunlight. The aim is to supplement natural daylight and raise growth light levels in order to enhance photosynthesis and thereby improve the growth and quality of plants in greenhouses. 

• For top lighting OLSON® Square LEDs are recommended to achieve the highest efficacy.
• Based on this, PrevaLED^® Brick Horticulture LED Modules and OPTOTRONIC^® FIT 380/220-400/1A4 D NFC HC L Driver provide a perfect Top Lighting system

Using LEDs as a light source is a perfect solution to enable inter lighting. In this case the light sources are placed in between the plants and the leaves. This reduces the shade of the leaves which may result from top lighting and thus increase the amount of light even on the lower leaves. Unlike with hot HPS luminaires, the low temperatures of the LED luminaire do not cause any damage to the plants. Inter lighting is considered as supplemental lighting since the LED lighting is typically used in greenhouses in addition to natural daylight.

• For inter lighting OSLON® SSL LEDs are recommended as a compromise between efficacy and uniformity. Other combinations are also possible (e.g. the OSLON® Square at lower currents for high efficacy or the OSCONIQ® P 2226 for high uniformity).
• Based on this, PrevaLED^® Brick Horticulture LED Modules and OPTOTRONIC^® Horticulture Driver offer a perfect Inter Lighting system

In vertical farms, plant factories or multi-layer cultivation applications the crop is grown in layer one on top of each other. The light is placed directly above and in close proximity of the crop. This only allows “cold” light sources such as LED luminaires to ensure that the plants are not burned by the high temperature of the light source. Uniform illumination is necessary in order to achieve the even growth of the crop over the complete plant area. Due to the stacking of plant layers the plants grow completely under artificial light without any daylight at all. This is also referred to as sole-source lighting. This gives complete control over the timing, amount and spectral composition but also requires a complete light content. If people work under  these lighting conditions a white light impression is necessary to enable the workers to assess the quality of the plants. 

• For vertical  farming OSCONIQ® P 2226 LEDs are recommended for high uniformity especially in blue. Combinations with other LEDs are also possible to achieve a good compromise between  uniformity and efficiency. Therefore the use of OSLON® SSL or OSLON® Square LEDs is also possible.
• Based on this, PrevaLED^® Brick Horticulture LED Modules and OPTOTRONIC^® Horticulture Driver provide a best fitting solution for Vertical Farming lighting systems