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Tab. 8: Energy costs and investment into lights in seedling production and continuous production for one growing circle of tomatoes under different light sources
Tab. 8: Energy costs and investment into lights in seedling production and continuous production for one growing circle of tomatoes under different light sources.
Costs (ISK/m2)
HPS, Hybrid+LED
LED, Hybrid+LED HPS, Hybrid LED, Hybrid
Young plant production
Electricity distribution 1
85 72 85 72 Electricity sale 2 490-555 415-470 490-555 415-470 ∑ Electricity costs 575-640 487-542 575-640 487-542
Continous plant production
Electricity distribution 1 454 454 596 598 Electricity sale 2 2.620-2.965 2.620-2.965 3.439-3.892 3.450-3.905 ∑ Electricity costs 3.074-3.419 3.074-3.419 4.035-4.488 4.048-4.503
Total
Electricity distribution 1 539 526 681 670 Electricity sale 2 3.110-3.520 3.035-3.435 3.929-4.447 3.866-4.375 ∑ Electricity costs 3.649-4.059 3.561-3.961 4.610-5.128 4.536-5.045
Young plant production
Lamps 3 120 483 120 483 Bulbs 4 57 57 ∑ Investment lights 177 483 177 483
Continous plant production
Lamps 3 3.032 3.032 2.780 2.780 Bulbs 4 229 229 401 401 ∑ Investment lights 3.261 3.261 3.181 3.181
Total
Lamps 3 3.152 3.515 2.900 3.263 Bulbs 4 286 229 458 401
Total light related costs 7.087-7.497 7.305-7.705 7.968-8.486 8.200-8.709
1 Assumption: On average around 1 ISK/kWh after 95% substitution from the state (according to data from Orkustofnun in the year 2019) 2 Assumption: Around 5,77-6,53 ISK/kWh (according to data from Orkustofnun in the year 2019) 3 HPS lights: 27.100 ISK/lamp, life time: 8 years, LEDs: 50.000 ISK/lamp, life time: 11 years 4 HPS bulbs: 4.000 ISK/bulb, life time: 2 years
