In the table below the consumption of different resources is compared. Greenhouses can achieve net negative electricity use.
Scenario 1.5 (LED + CHP) has a net negative electricity use. This mean that on an annual basis the greenhouse sells more electricity to the grid than in buys. This is the result of a higher efficiency of LEDs and increased CHP operation for heating, compared with HPS-lamps. Illumination results in a higher water use.
The higher greenhouse temperatures in combination with higher PAR sums result in a higher water use for illuminated scenarios. HPS results in a higher water use than LEDs.
When using LEDs instead of HPS, the water use is reduced. LEDs does not emit Near-InfraRed radiation to the crop, resulting in lower crop temperatures and consequently less transpiration.
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