# How much CO2 does replacing factory high-bay lights with LEDs save?

Canonical: https://senseible.earth/answers/led-lighting-retrofit-factory-co2-saving

Watts saved per fitting × fittings × hours run × 0.710 kg CO2 per kWh. Replacing 100 metal halide high-bays of 250 W with 120 W LEDs, run 3,600 hours a year, saves about 46,800 kWh and 33 tonnes of CO2.

## Get the inputs right

- Actual wattage including ballast, from a meter or the fitting label.
- Run hours from shift patterns.
- Light levels: fewer, better placed fittings can save more.

## Prove it

Sub-meter the lighting circuit for a month before and after. The bill alone hides lighting inside total load.

## Example: 100 high-bays

- (250 − 120) W × 100 = 13 kW
- 13 kW × 3,600 h = 46,800 kWh
- 46,800 × 0.710 = 33.2 t CO2 a year

## What Senseible does here

Senseible reads electricity bills, including kVAh, demand and solar export lines, into dated records with the units, factor and year behind every Scope 2 figure.

- [Motor replacement savings](https://senseible.earth/answers/ie2-to-ie4-motor-replacement-savings)
- [VFD savings on pumps and fans](https://senseible.earth/answers/vfd-pump-fan-energy-co2-savings)
- [Solar water heater savings](https://senseible.earth/answers/solar-water-heater-factory-co2-savings)

Sources: [CEA CO2 Baseline Database, version 21.0](https://cea.nic.in/cdm-co2-baseline-database/?lang=en), [Bureau of Energy Efficiency, energy efficiency guides](https://beeindia.gov.in)

Last reviewed 2026-10-22.