Introduction

A standard no name brand 60W incandescent lamp was purchased from Pick n Pay and retailed at R10 exactly. The lamp was tested and produced on average 500lm.

The Flash Components 7W LED A60 ECO lamp retails between R50 to R60. For this comparison R60 was selected for the retail price. The lamp also produces on average 500lm.

Therefore the 7W LED A60 ECO lamp is directly comparable to the standard 60W incandescent lamp.

Description of Norms & Formulas Used

The calculations were performed using the following norms and assumptions.

A household uses on average 10 incandescent lamps to light up a house.

Inflation is on average 6%. The last 10 years inflation figures were used.

The lifetime of a LED lamp A60 ECO is 15 000 hours (approximately 10 years) and an incandescent lamp will last for 1000 hours (approximately 1 year).

The yearly increase in electricity is 8%. This is the figure that has been set NERSA.

The electricity price used is from the City of Cape Town for a domestic household that uses less than 600kWh per calendar month.

The household runs the lamps for on average 4 hours a day.

It was assumed that the consumer will already have incandescent lamps installed in the house therefore there is no initial cost added to calculations for year 1.

Total Wattage (kW) = (Avg Lamps per Household * Lamp Wattage) / 1000 – The total wattage of all the lamps in the household written in kW.

Cost per Hour = (Total Wattage * Electricity Price)/100 – The amount it costs the consumer to run the specific lamp per hour.

Cost per Day = Cost per Hour * Average Runtime per Day – The amount it costs the consumer to run the specific lamp for a day (4 hours).

Cost per Year = Cost per Day * 365 – The amount it costs the consumer to run the specific lamp for a year.

Cost Electricity + Lamp = Cost per Year + Total Price for Lamps – The amount the consumer has to pay for electricity and the cost of the lamps as well.

Saving Including Lamp Cost = (Incandescent Cost Electricity + Lamp) – (A60 Cost Electricity + Lamp) – The saving that the consumer will make if they choose a LED A60 lamp over an incandescent lamp.

Electricity Saving Over 1 Year – Excluding Lamp Costs

Lamp Type Avg Lamps per Household Lamp Wattage (W) Total Wattage (kW) Electricity Price (ckWh) Cost per Hour Avg Runtime per Day (Hrs) Cost per Day Cost per Year
60W GLS (Incandescent) 10 60 0.6 153.63 R 0.92 4 R 3.69 R 1 345.80
7W A60 LED 10 7 0.07 153.63 R 0.11 4 R 0.43 R 157.01
Total Saving R 1 188.79
Electricity Saving Over 10 Years – Including Lamp Costs
Year Lamp Type Price per Lamp – Including Inflation Avg Lamps per Household Total Price for Lamps Individual Lamp Wattage (W) Total Wattage (kW) Electricity Price (ckWh) – Including Inflation Cost per Hour Avg Runtime per Day (Hrs) Cost per Day Cost per Year Cost Electricity + Lamp Saving Including Lamp Cost
0-1 60W GLS (Incandescent) R 0.00 10 R 0.00 60 0.6 153.63 R 0.92 4 R 3.69 R 1 345.80 R 1 345.80 R 588.79
7W A60 LED R 60.00 10 R 600.00 7 0.07 R 0.11 R 0.43 R 157.01 R 757.01
1-2 60W GLS (Incandescent) R 10.60 10 R 106.00 60 0.6 165.92 R 1.00 4 R 3.98 R 1 453.46 R 1 559.46 R 1 389.89
7W A60 LED R 0.00 10 R 0.00 7 0.07 R 0.12 R 0.46 R 169.57 R 169.57
2-3 60W GLS (Incandescent) R 11.24 10 R 112.36 60 0.6 179.19 R 1.08 5 R 5.38 R 1 962.17 R 2 074.53 R 1 845.61
7W A60 LED R 0.00 10 R 0.00 7 0.07 R 0.13 R 0.63 R 228.92 R 228.92
3-4 60W GLS (Incandescent) R 11.91 10 R 119.10 60 0.6 193.53 R 1.16 4 R 4.64 R 1 695.32 R 1 814.42 R 1 616.63
7W A60 LED R 0.00 10 R 0.00 7 0.07 R 0.14 R 0.54 R 197.79 R 197.79
4-5 60W GLS (Incandescent) R 12.62 10 R 126.25 60 0.6 209.01 R 1.25 4 R 5.02 R 1 830.94 R 1 957.19 R 1 743.58
7W A60 LED R 0.00 10 R 0.00 7 0.07 R 0.15 R 0.59 R 213.61 R 213.61
5-6 60W GLS (Incandescent) R 13.38 10 R 133.82 60 0.6 225.73 R 1.35 4 R 5.42 R 1 977.42 R 2 111.24 R 1 880.54
7W A60 LED R 0.00 10 R 0.00 7 0.07 R 0.16 R 0.63 R 230.70 R 230.70
6-7 60W GLS (Incandescent) R 14.19 10 R 141.85 60 0.6 243.79 R 1.46 4 R 5.85 R 2 135.61 R 2 277.47 R 2 028.31
7W A60 LED R 0.00 10 R 0.00 7 0.07 R 0.17 R 0.68 R 249.15 R 249.15
7-8 60W GLS (Incandescent) R 15.04 10 R 150.36 60 0.6 263.29 R 1.58 4 R 6.32 R 2 306.46 R 2 456.83 R 2 187.74
7W A60 LED R 0.00 10 R 0.00 7 0.07 R 0.18 R 0.74 R 269.09 R 269.09
8-9 60W GLS (Incandescent) R 15.94 10 R 159.38 60 0.6 284.36 R 1.71 4 R 6.82 R 2 490.98 R 2 650.36 R 2 359.75
7W A60 LED R 0.00 10 R 0.00 7 0.07 R 0.20 R 0.80 R 290.61 R 290.61
9-10 60W GLS (Incandescent) R 16.89 10 R 168.95 60 0.6 307.11 R 1.84 4 R 7.37 R 2 690.26 R 2 859.21 R 2 545.34
7W A60 LED R 0.00 10 R 0.00 7 0.07 R 0.21 R 0.86 R 313.86 R 313.86
Total Saving R 18 186.20

Conclusion

It can be seen that the consumer will save R1188.79 in electricity over one year if they use Flash Components 7W A60 ECO lamp.
It can be seen that in year one the consumer will have to absorb the initial cost of the A60 lamps. After year one it can be clearly seen that the consumers saving each month will increase due to the rising electricity price and the fact that they will need to replace the incandescent lamps each year is used.
Therefore the consumer will save a total R18 186.20 over a period of 10 years if they use Flash Components 7W A60 ECO lamp.