Save more than Rs. 700 per year, with Philips CFL and T5 tube lights

September 7, 2010

AssumptionsT5CFLi
1. GLS Bulb Wattage (in W)100100
2. Energy Efficient Lamp Wattage (in W)1418
3. Usage Days per Year350350
4. Price per unit of electricity (1kWh) in INR55
5. Usage per day (in hrs)66
 
Variable Costs Calculation
 
Saving per point (in W)8682
 
Usage per point per annum (in hrs)21002100
 
Electricity saved per annum (in kWh)180.6172.2
 
Savings per annum (in INR)903861
 
Fixed Costs Calculation
 
Initial Cost per Lamp
For T5 with Luminaire (Tarang Electronic)335 
For CFLi 140
 
Life in years52
Cost per year6770
 
Cost per year for GLS (Life = 1 year)1313
 
Net fixed cost impact vs. GLS per annum-54-57
 
Net savings (incl. Fixed cost impact)849804