Light Emitting Diodes (LEDs) use about 30% of the electrical power consumed by compact fluorescent lamps (CFLs) of the same brightness. If your CFL’s consumption averages 2.5 kWh/day, and the electrical tariff is 43c/kWh, calculate the savings you could achieve by replacing your lights with LEDs? (Ignore the capital cost of the lamps). Select one correct answer.

To calculate the savings achieved by replacing compact fluorescent lamps (CFLs) with light-emitting diodes (LEDs), follow these steps:

1. **Current CFL consumption:**
   - CFL consumption = 2.5 kWh/day
   - Cost per kWh = 43 cents/kWh

   So, the daily cost of using CFLs:
   \[
   \text{Daily cost of CFLs} = 2.5 \, \text{kWh/day} \times 43 \, \text{cents/kWh} = 107.5 \, \text{cents/day} = \$1.075/day
   \]

2. **LED power consumption:**
   - LEDs use 30% of the power consumed by CFLs, so LED consumption will be:
   \[
   \text{LED consumption} = 30\% \times 2.5 \, \text{kWh/day} = 0.30 \times 2.5 = 0.75 \, \text{kWh/day}
   \]

3. **Daily cost with LEDs:**
   \[
   \text{Daily cost of LEDs} = 0.75 \, \text{kWh/day} \times 43 \, \text{cents/kWh} = 32.25 \, \text{cents/day} = \$0.3225/day
   \]

4. **Savings per day:**
   \[
   \text{Daily savings} = \text{Daily cost of CFLs} - \text{Daily cost of LEDs} = 1.075 - 0.3225 = \$0.7525/day
   \]

So, the savings per day by switching from CFLs to LEDs is approximately **75 cents/day**.

### Summary:
- **Daily savings**: \$0.7525/day
- **Correct answer**: The closest option is **75 cents/day**.

Would you like to see further details or have any questions?

Here are 5 related questions to expand your understanding:
1. How do energy tariffs affect overall electricity savings when switching to LEDs?
2. How much energy would you save over a month by switching to LEDs?
3. What is the difference in lifespan between LEDs and CFLs?
4. What is the total yearly savings when using LEDs compared to CFLs?
5. How does the efficiency of LEDs compare to incandescent bulbs?

**Tip:** Always consider both energy consumption and lifespan when calculating the total cost of ownership for light bulbs.

Learn how to calculate savings by replacing compact fluorescent lamps (CFLs) with light-emitting diodes (LEDs). This problem involves energy consumption calculations and electricity cost analysis based on a given electrical tariff. Discover how much you can save daily by switching to LEDs. Suitable for anyone interested in energy efficiency and cost savings.

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