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sci.photosynthesis-efficiency Calculator
Calculates photosynthetic efficiency as fraction of incident solar energy converted to biomass, accounting for PAR fraction and quantum yield. Maximum theoretical photosynthetic efficiency is ~11% — measured field efficiency is 0.5–2% for most crops, with C4 crops (maize, sugarcane) achieving up to 3–4%.
Inputs
Solar Irradiance W M2
Reference formula or conversion factor shown for context.
Plant Area M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Glucose G Day
Blood sugar level. Fasting normal: 70–99 mg/dL. 100–125 = prediabetes. 126+ = diabetes (confirmed on two tests).
Light Spectrum Frac
Reference formula or conversion factor shown for context.
Results
photosynthetic efficiency (total solar)
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.
PAR utilization efficiency
Fraction of capacity actually being used. Above 80–85% is typically considered high utilisation; above 95% leads to queuing and latency spikes.
solar energy input (kJ/day)
Sample size or count used in the calculation.
theoretical PAR efficiency max
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.
C3 crops actual efficiency
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.