The MLR m12 is designed as a repair kit and for use at the goal mouths and other areas of the pitch with high wear. It is fitted with 12 each 1000W fixtures and bulbs.
At a modern stadium in Northern part of Europe the full pitch might be in the shade during winter months. To effectively treat such a pitch of about 7 000sqm, 3 such units are normally required. The number of units required obviously depends on the shade issue at a specific stadium.
MLRt can be raised or lowered which allows the pitch to be illuminated at different heights; this enables areas with low grass coverage or excessive wear to be individually targeted.
The MLR w24 is a bespoke design for lawn tennis and was developed in close cooperation with AELTC< and has been in operation at Centre Court, Wimbledon, for about one year with great success. Centre Court has recently been equipped with a retractable roof and to counteract an indoor climatic< environment a second unit was delivered this autumn.
Why use our products
The first biological tests using artificial light started at Bioforsk in 1999. Three series of biological tests have been carried out at Bioforsk from 1999 to 2003. A comprehensive wear test took place in the cold winter months of 2002-2003 on a test area of 120 square metres, which gave the results listed above
- Supplementary lighting enables growth of high quality grass in enclosed stadiums during winter
- High lighting levels are required
- The different species and varieties of grass react differently to supplementary lighting
- Use of supplementary lighting reduces the diseases that affect grass
One of the more surprising results was that the area treated with light had far more root growth than anywhere else on the pitch. This indicates that areas of heavy wear, for instance at the goal mouths, can be transformed with this treatment into areas with more grass than normally found in untreated areas also at the height of summer.
The results of these trials provided the basis for the specifications for the Mobile Lightning Rig.
The main advantage is that the technology provides sufficient artificial lighting for grass growth in shaded areas. This means that areas treated with the MLR lights have more growth, including root growth, than elsewhere. The result is that the pitch does not have to be re-turfed several times a year, which enables substantial savings. Another advantage, aside from improving the look of the stadium, is the resulting strong rooting system that tolerates far more play. Operational costs for the MLR system are also lower than for the use of sub-turf heating. Sub-turf heating has the disadvantage of destroying the roots of the grass if it is used too often, which once again results in a poorer grass surface.
Results of research projects, Bioforsk:
Bioforsk is one of several large research institutes in Norway, with 392 employees. A total of 94 of these employees have doctoral degrees. Three new doctoral candidates were approved in 2004.
1. Bioforsk, 2000. 'Use of supplementary lighting growing sports grass'
Summary: The trials were financed by MLR. Six different species of grass were exposed to three different lighting levels (5, 10 and 15 klux) over 20 hours per day in growth chambers. Fertilizing represented another variable. Growth and solid plant matter content were measured from cuttings each week. Duration: 15 weeks. The density of the grass cover was roughly estimated after the last cutting. The results show that considerable lighting levels are required in order to achieve acceptable growth.
2. Bioforsk, 2001. 'Use of supplementary lighting growing sports grass, Selection of illumination strategy'
Summary: The trials examined how different illumination strategies influence grass growth. Kentucky blue grass gave better results than rye grass. 20 hours of illumination per day, 4 hours rest. The light can be on for one day and then off two days, or on for 10 days and off 20 days. This indicates that one third coverage is satisfactory.
3. Bioforsk, 2002. 'Use of supplementary lighting growing sports grass, Adding CO2'
Summary: The trials show that the effect of CO2 is highest for rye grass.
4. Bioforsk, 2003. 'Large scale trials of illumination strategy growing sports grass. Wear trials.'
Summary: The trials were carried out in a 160 m2 plastic house with open side walls. The pitch was sown in January. By end of March, the grass turf was well established. The following winter a wear test was carried out, where wear from one, two or four games per week were simulated. The tests showed that for certain grass species growth could be maintained throughout the winter with temperatures down to -10 degrees Celsius. Later trials in Stockholm have verified this, showing that the grass can survive a few days of extreme cold weather with temperatures down to -30 degrees under the lighting rig with the sub-turf heating system on. The heat stayed in the growth masses and the temperature in the root zone was always (Nov-Feb) above the required minimum, facilitating root growth and absorption of nutrients.