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Case StudiesPhilips GreenPower LEDtoplighting andinterlightingMežvidiVegetables & FruitProjectMežvidi GreenhouseSectorFruit and vegetablesCropKomeet tomatoes andTomawak tomatoesLocationMežvidi,LatviaSolutionPhilips GreenPower LEDtoplighting and LEDinterlightingPhilips LED Horti PartnerHelle OYMežvidi is one of the most moderngreenhouses in the Baltic States, withmore than € 1.5 million invested instate-of-theart lighting, sprinkling andheating systems. Its first tomatoproduction started in January 2013, with‘Komeet’ as the main variety; plantdensity was 2.5 plants per square meterover a total area of 0.5 ha.A new production strategy would enablethem to capitalize on the premiumprices in the darkest period of the harshLatvian winter. Mežvidi set themselvesthe target of increasing the amount oflight without having to spend more onenergy consumption.By reducing the number of HID toplightsby 282 pieces, the greenhouse couldhave 921 additional LED interlights. Aftermany calculations and variousmeasurements, Mežvidi reached 13 molDLI per plant. ‘We looked at all possibleoptions,’ says Romanovskis. ‘PhilipsGreenPower LED interlighting seemedideal in terms of cost and performance- it was also backed by the system´sproven track record.The results were clear. ‘With the LEDinterlighting we can have more plantsper square meter and reach themaximum plant density earlier, while atthe same time maintaining optimalclimate and the necessary light levelduring the dark winter days.’The success of LED interlighting atMežvidi has prompted the greenhouseto investigate the advantages of LEDtoplighting as wel.ObjectiveAbility to produce winter cropsprofitably: 8000 kg/week inJanuary at 0,5 ha greenhouse“We thoroughly investigated all possiblesolutions available, and concluded that PhilipsGreenPower LED interlighting was by far themost beneficial.”38 Philips Horticulture LED Solutions - General booklet