Innovative Turf Care for a Sustainable Future
Innovative Turf Care for a Sustainable Future

The importance of Light Distribution

Increase energy efficiency and generate homogeneous grass growth 
The importance of light distribution in LED grow light systems is many times seriously underestimated. Grass is sensitive to fluctuations over the turf pitch in received PPFD and is in the absolute need of a proper light distribution to ensure an even growth. Applications which require perfect beam distribution or more complex beam patterns can be seen in street lighting, stadium lighting and of course horticulture grow light applications. When we look at horticulture LED lighting, a perfect even light distribution over the turf from a single luminaire is still something most brands seem to have difficulties with to manage.

A lot of horticulture LED applications use LED emitters on an extruded heat sink without use of any optics to control the beam distribution. As a result the light received at the turf pitch will fluctuate according Imax . cosPhi what means that the light intensity straight under the LED is much higher than on the sides of the beam angle. This result in different PAR values over the turf pitch with fluctuations in the growth process of the grass as a result.

A LED package without secondary optics has a typical light distribution angle of 120° or 80°. This means that when the energy directly under the light fixture = 100%, you will have a light and energy decrease to 80% at 30 degrees left and right, and a further erosion to 40% at 60 degrees left and right of the luminaire.
lambertian-optical-source
relative-luminous-flux
Light decrease in function of beam angle of a 120° LED package without optic light distribution.

Introducing the Batwing technology

Of course you can kind of overcome this by placing many LED grow lights close together and make overlaps so that the energy at the turf pitch gets a bit more in balance, but in many cases we still see fluctuations of over 30%, while this also leads in many cases to the need of placing extra construction bars in the grow light system which is making the solution cost-inefficient and heavier.

Actually, the solution to make a complete even light distribution over your canopy isn’t that difficult. It exists already for years in the white light market and even has a proper name. It is called "batwing technology".

All initial output light beams of the LED package are scattered and redistributed in a light shape in this way that the light within the beam angle is completely even distributed. As a result you get a homogeneous light distribution over your turf pitch of more than 90%.
batwing-light-distribution-within-the-beam-angle
So for lighting applications where light distribution is a must, you want to create a light source as small as possible in order to have a perfect beam control. In HPS SON-T lamps the beam pattern was mainly created through a reflector which redistributed the light from the back side towards the sides into an oval light shape. In LED lighting more complex beam shapes are created through a TIR or Total Internal Reflection lens.
Total_internal_reflection_(TIR)_lens_Legancy-reflector
By creating the very concentrated LED light engine Mechatronix CoolStack® which we apply, we are able to use advanced batwing lens technology to create a light distribution over the turf within 90% homogeneity. This ensures an unprecedented even grass growth compared to competing systems. All together these full passive cooled advanced grow lights produce an absolute market leading PPFD up to 3.520µmol/s, which as a result increase Homogeneous grass growth, better performance and less chance on player injuries because of higher quality turf.
Mechatronix Coolstack
Mechatronix CoolStack® LED grow lights. Lenses clearly visible

Request a turf care advice

Are you looking to ensure grass growth and recovery throughout the year, while maintaining a consistently strong and healthy turf pitch?

We can help you reach your goals through our innovative turf care systems and data driven approach. With our innovative approach, we aim to become your reliable and innovation partner in providing a diverse range of turf care and growlight solutions.

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Stogger Engineering BV
Maasbreeseweg 55a
5981 NB Panningen
the Netherlands
info@stadiumgrowlight.com

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