light bulb savings calculations
How your savings are calculated
Step 1 find the number of INC bulbs needed over this bulb's lifetime25000 / 750 = 33.3333 |
Step 2 determine the cost of replacement INC bulbs and the difference with this bulb's cost33.3333 * $0.50 = $16.67 cost of replacing the INC bulb $16.67 - $7.95 = $8.72 replacement savings |
Step 3 determine energy usage over the life of this bulb35 watts * 25000 hours / 1000 watts per kW = 875 kWh 4.1 watts * 25000 hours / 1000 watts per kW = 102.5 kWh |
Step 4 subtract to find the difference in energy usage between the bulbs875 kWh - 102.5 kWh = 772.5 kWh lifetime savings |
Step 5 find the lifetime energy cost savings772.5 kWh * $0.118 = $91.16 |
Step 6 combine energy savings with replacement cost savings to find total lifetime savings$91.16 + $8.72 = $99.87 total lifetime savings |
Step 7 find savings per year5 hours per day * 365 days per year = 1825 hours per year 1825 hours per year / 25000 lifetime hours = 7.30 % of bulb life used per year 7.30 % * 772.5 kWh lifetime savings = 56.3925 kWh yearly savings 7.30 % * $99.87 lifetime savings = $7.29 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.