If you are a corporate buyer or purchase manager, we provide the following case studies of benefit of green sourcing and thereby reduction of carbon footprint.
1. Product: LED Lamps
Green Adv.: Substitution of CFL & incandescent lamp, high energy saving
Economy of replacing a Sodium Vapour Lamp by LED Lamp (Outdoor Street Light application):
| Sodium Vapour Lamp | LED lamp |
| Cost of 150 Watt Sodium Vapour Lamp with fitting: Rs 5000 | Cost of 40 W LED lamp with fittings: Rs 12000 |
| Actual Power consumed by 150 W sodium Vapour lamp with Ballast: 170 Watt | Power consumption of 40 Watt LED Lamp: 40 Watt |
| Energy Cost of Sodium Vapour Lamp per Year: 170x12x365x4/1000 = Rs 2978 | Energy Cost of 40 W LED lamp per year: 40x12x365x4/1000 = Rs 700 |
| The life period of Sodium Vap lamp is 2 - 3 years | 10 years minimum for LED lamps |
Savings in Power: 170-40=130 Watts
Savings in cost per year: Rs 2978-700= Rs 2278
The initial cost diff of Rs 9000/- is paid back in less than 4 years
time by savings in Energy cost only.
Economy of replacing a fluorescent lamp by LED Lamp (Indoor application):
| Fluorescent lamp | LED lamp |
| Fluorescent Lamp with fitting = Rs 200 say | Cost of LED Light = Rs 3600/- |
| 40 w bulb actually consumes power around 80 watts | 12 W LED lamp consumes around 12 watt |
For 10 hour operation for a year: 680 x 26 x 12 = 212 KWhr = 212 Units
Savings in power: 80-12= 68 W i.e the energy cost will be reduced
by around 85 %
Savings in cost: Rs 4/unit = 212x4 = Rs 848
The initial Cost Diff of Rs 3600 -200 = Rs 3400 will be paid back in 3400/ 848
= 4 Years with the electricity bill reduced by 85%.
2. Product: Gas Generator
Green Adv.: Substitution of diesel based
generators; reducing the level of toxic fumes/GHG gases while combustion &
cost much cheaper.
Cost analysis for a Gas Generator vis-a-vis Diesel Generators
| Characteristics | Diesel Gensets | Gas Gensets |
| Lifespan | 10 yrs | 15 yrs |
| Cost | 5.2 lacs INR (for 100 Kw) | 9.35 lacs INR (for 100 Kw) |
| Cost of maintenance | 20K INR/yr | 10K INR/yr |
| Cost of fuel (i.e. driving energy) | 36 INR/ltr | 30 INR/kg ~ 25 INR/ltr |
Breakeven for Gas gensets with 18 hrs of running/day will happen in 2 months.