Step 1 find the number of INC bulbs needed over this bulb's lifetime

50000 / 750 = 66.6667

Step 2 determine the cost of replacement INC bulbs and the difference with this bulb's cost

66.6667 * $0.50 = $33.33 cost of replacing the INC bulb

$33.33 - $14.95 = $18.38 replacement savings

Step 3 determine energy usage over the life of this bulb

32 watts * 50000 hours / 1000 watts per kW = 1600 kWh

14 watts * 50000 hours / 1000 watts per kW = 700 kWh

Step 4 subtract to find the difference in energy usage between the bulbs

1600 kWh - 700 kWh = 900 kWh lifetime savings

Step 5 find the lifetime energy cost savings

900 kWh * $0.118 = $106.20

Step 6 combine energy savings with replacement cost savings to find total lifetime savings

$106.20 + $18.38 = $124.58 total lifetime savings

Step 7 find savings per year

5 hours per day * 365 days per year = 1825 hours per year

1825 hours per year / 50000 lifetime hours = 3.65 % of bulb life used per year

3.65 % * 900 kWh lifetime savings = 32.85 kWh yearly savings

3.65 % * $124.58 lifetime savings = $4.55 yearly savings