LED Toplighting vs. 1000W HPS: 5-Year ROI & Heat Balance Model
Simulate the capital expense, annual electricity savings, photon efficacy (µmol/J), and supplemental boiler heating requirements when retrofitting HPS to high-efficiency LED fixtures.
⚙️ Facility & Lighting Operational Inputs
Target Canopy PPFD200 µmol/m²/s
Annual Burning Hours3,000 Hours/yr
Electricity Tariff ($/kWh)$0.14 / kWh
Greenhouse Area10,000 m² (1 ha)
Annual Energy Savings
$235,200
- 48.6% Power Draw
LED Retrofit Payback
3.2 Years
At $0.14/kWh Tariff
5-Year Net ROI
+ $425,000
Cumulative Savings
Supplemental Boiler Heat
+ 12.4 W/m²
Lost HPS Convection
💡 SOTA Horticultural LED3.5 µmol/J
Custom spectral tuning (Deep Red 660nm + Far-Red 730nm + Blue 450nm) delivers 95%+ photon efficacy with 50,000-hour L90 diode lifespan. Minimal downward radiative heat protects sensitive canopies.
🔥 Legacy 1000W DE HPS1.8 µmol/J
High infra-red radiant heat load (~45% of total input energy) heats the upper crop canopy directly, but requires bulb replacements every 10,000 hours and consumes double the electrical power.
⚖️ Engineering & Financial Modeling Disclaimer:
Equipment efficiencies, utility tariffs, and payback periods are modeled using standard industrial benchmarks (ASABE S640, ASHRAE, Fraunhofer ISE). Actual farm operational performance may vary by manufacturer binning, regional energy contracts, and crop transpiration demand. Always obtain vendor performance warranties and consult certified Professional Engineers.