An LED Night Light typically uses between 0.0005 kWh and 0.02 kWh per night, depending on its power rating and usage duration. Here's a detailed breakdown:
1. Power Consumption Range of LED Night Lights
Low-power models: 0.2W to 0.5W
Example: A 0.34W LED Night Light used for 10 hours consumes 0.0034 kWh (0.34W × 10 hours ÷ 1000).
Over a year (365 days), this totals 1.24 kWh, costing about 0.18 (assuming 0.15 per kWh).
Mid-power models: 1W to 2W
Example: A 1W LED night light used for 10 hours consumes 0.01 kWh (1W × 10 hours ÷ 1000).
Over a year, this totals 3.65 kWh, costing about 0.55.
High-power models: 4W to 6W
Example: A 6W LED night light used for 10 hours consumes 0.06 kWh (6W × 10 hours ÷ 1000).
Over a year, this totals 21.9 kWh, costing about 3.29.
2. Key Factors Affecting Energy Use
Power rating (watts): Lower-wattage LEDs (e.g., 0.34W) are far more efficient than higher-wattage models (e.g., 6W).
Usage duration: Leaving the light on all night (e.g., 10 hours) increases consumption compared to short-term use.
Sensor technology: Models with motion sensors or timers may reduce energy use by activating only when needed.
3. Cost Comparison with Other Lighting Types
Incandescent Night Lights: Use 4W to 7W, costing 1.05 per year (for 10 hours/night).
Fluorescent night lights: Use 7W to 10W, costing 1.50 per year.
LED night lights: Use 0.2W to 6W, costing 3.29 per year, making them the most energy-efficient option.
4. Practical Example
A 0.4W LED night light (like the one mentioned in the reference) used for 10 hours/night:
Daily consumption: 0.004 kWh (0.4W × 10 hours ÷ 1000).
Monthly consumption: 0.12 kWh (0.004 kWh × 30 days).
Yearly consumption: 1.46 kWh (0.004 kWh × 365 days).
Cost: 0.22 per year (at 0.15 per kWh).
5. Recommendations
Choose low-wattage LEDs (0.2W to 1W) for minimal energy use.
Use sensors or timers to limit operation to necessary periods.
Replace incandescent/fluorescent models with LEDs to save 80–90% on energy costs.
