What factors make up the formula for annual savings in euros?

The formula for calculating the annual savings in euros when transitioning to LED technology is based on the comparison of consumption and operating costs. According to sources, the specific factors that make up this formula are the following:

$Ahorro_Anual_(€) = (W_{antiguo} - W_{nuevo}) \times Horas_Uso \times Precio_kWh$.

The components of this equation are detailed below:

• Power difference ($W_{antiguo} - $W_{nuevo}): It is calculated by subtracting the watts of the new LED luminaire ($$W_{nuevo}) from the power of the conventional or old light source ($$W_{antiguo}). This change usually represents a reduction in consumption of between 50% and 80%.
• Hours of use: This refers to the number of hours per day that the light remains on. The economic impact is significantly greater in installations where lights operate uninterrupted or for many hours a day.
• Price per kilowatt-hour ($Precio_kWh$): This is the unit cost of the electricity paid to the retailer (for example, €0.14 per kWh).
• Number of luminaires: To obtain the total savings of a project, it is necessary to multiply the result of the above formula by the total number of bulbs or luminaires to be replaced.

Additional Profitability Factors

In addition to the direct consumption formula, the sources mention other elements that influence real economic savings in the long term:

• Service life and maintenance: High-end LEDs last between 50,000 and 150,000 hours. This longevity drastically reduces replacement and labor costs for maintenance, especially in hard-to-reach locations such as warehouses or parking lots.
• Repayment period: To evaluate the investment, the formula that divides the total cost of the upgrade (purchase and installation) by the annual energy savings is used. In commercial environments, the return on investment is usually achieved in less than two years.
• Smart Controls: The use of occupancy sensors and daylight harvesting systems can optimize energy use, generating additional savings by automatically turning off or dimming lights when they are not needed.

Metaphor to understand the concept: Calculating these savings is like comparing the fuel consumption of two vehicles: the formula simply measures the difference in "liters" (watts) that each engine consumes, multiplied by the distance traveled (hours) and the price per liter (kWh). At the end of the year, the LED is the efficient car that allows you to travel the same path while spending a fraction of the budget.