light bulb savings calculations
How your savings are calculated
Step 1 find the number of INC bulbs needed over this bulb's lifetime15000 / 750 = 20 |
Step 2 determine the cost of replacement INC bulbs and the difference with this bulb's cost20 * $0.50 = $10.00 cost of replacing the INC bulb $10.00 - $5.95 = $4.05 replacement savings |
Step 3 determine energy usage over the life of this bulb40 watts * 15000 hours / 1000 watts per kW = 600 kWh 3.8 watts * 15000 hours / 1000 watts per kW = 57 kWh |
Step 4 subtract to find the difference in energy usage between the bulbs600 kWh - 57 kWh = 543 kWh lifetime savings |
Step 5 find the lifetime energy cost savings543 kWh * $0.118 = $64.07 |
Step 6 combine energy savings with replacement cost savings to find total lifetime savings$64.07 + $4.05 = $68.12 total lifetime savings |
Step 7 find savings per year5 hours per day * 365 days per year = 1825 hours per year 1825 hours per year / 15000 lifetime hours = 12.17 % of bulb life used per year 12.17 % * 543 kWh lifetime savings = 66.065 kWh yearly savings 12.17 % * $68.12 lifetime savings = $8.29 yearly savings |
Savings calculations are presented as an example of potential savings; actual savings may vary based on use, utility rates and other factors.
Calculations are based on national averages and assumptions and may be adjusted for a more accurate estimate of individual savings.
While EnergyEarth strives to provide the most accurate information, we cannot guarantee the savings displayed.