LED Lights 101:

LED lights are getting very popular and well adopted by homeowners nowadays given their energy saving feature. Now the question is – Do we know the quantum of energy savings by adopting LED lights as compared to other lighting options?

They are two (2) terms we will be introducing here – (1) Lumen and (2) Wattage

Lumen is the measurement of brightness, and Wattage is the measurement of energy consumption.

The advantage of adopting LEDs is that they are able to achieve a relatively higher lumen at a relatively low wattage, and that explains the energy saving feature with LEDs. The below diagram clearly illustrates and contrasts the characteristics of different lightings in the market:


Referring to the above diagram, LEDs are only consuming 15% of the energy used by the traditional Incandescents and still provide the comparable lumen of 1600.



Case Study:

Assuming Household Y turns on one (1) light bulb for 6 hours a day and given the current household utility rate at $0.26 per kWh, we do a comparative study between LED (15W) and CFL (30W) which achieve the same Lumen of 1600.

Annual Energy Consumption (LED, 15W) = 0.015kW X 6 hours X 365 days X $0.26 = 32.85kWh or S$8.54

Annual Energy Consumption (CFL, 30W) = 0.03kW X 6 hours X 365 days X $0.26 = 65.7kWh or S$17.08

Based on the above calculation, you would have save 50% of the energy consumption or S$8.54 for only converting 1 CFL bulb to LED bulb in a year. Now, imagine you have 20 lights in your home, the cost saving would be very significant indeed!



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