Lighting Retrofit Calculator – Energy Savings & Payback AnalysisBy Karthikeyan / March 15, 2025 Lighting Retrofit Calculator Lighting Retrofit Calculator Based on ASHRAE 90.1, IESNA, ECBC, and LEED Standards Select Facility Type: Office (500 lx) Conference Room (750 lx) Retail Store (1000 lx) Warehouse (300 lx) Classroom (500 lx) Hospital (General Areas) (1000 lx) Hospital (ICU/OT) (1500 lx) Parking Areas (50 lx) Corridors & Hallways (100 lx) Factories (Precision Work) (750 lx) Enter Room Area (m²): Total Lux Requirement (lx): Existing System Select Existing Light Type: Incandescent (10-17 lm/W) Halogen Incandescent (15-25 lm/W) T12 Fluorescent (50-70 lm/W) T8 Fluorescent (75-100 lm/W) T5 Fluorescent (90-105 lm/W) Mercury Vapor (35-60 lm/W) Metal Halide (80-100 lm/W) High-Pressure Sodium (90-140 lm/W) Existing Fixture Efficacy (lm/W): Existing Fixture Wattage (W): Number of Existing Fixtures: Proposed System Select LED Light Type: LED Panel Light (100-120 lm/W) LED High Bay (110-140 lm/W) LED Tube Light (90-110 lm/W) LED Downlight (100-130 lm/W) LED Flood Light (120-150 lm/W) New Fixture Efficacy (lm/W): New Fixture Wattage (W): Number of Proposed Fixtures: Electricity Cost per kWh ($): Select Emission Factor (kg CO₂/kWh): Global Average (0.92 kg CO₂/kWh) Low-Carbon Grid (0.5 kg CO₂/kWh) High-Carbon Grid (1.2 kg CO₂/kWh) Retrofit Cost ($): Calculate
