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Replacing luminaires for LED – Industry

Rising electricity prices are forcing us to look for savings. Replacing luminaires for LED is one of the elements of cost reduction in industry. LED luminaires are characterized by low power consumption at high efficiency, moreover, the development of technology allows us to easy control. Is the popular “Lighting as a Service” is profitable? In this article I will try to check when replacing luminaires for led will be returned.

1. Assumptions:

The assumption of the article is to answer the question whether replacing luminaires for LED is profitable. The price of electricity will be determined according to the average price in the EU = 0.12 EUR / kWh. We will change all the luminaires for fixtures with integrated LED diodes. The number and power of luminaires will be determined on the basis of lighting standards. We will make a simple comparison without the influence of lighting control.

2. Analysis

 

[1.1] Industry Area (www.pexels.com)

The subject of the analysis will be a warehouse with a production area of 1200 m2. Currently, we have fixtures mounted at a height of 6 meters. The storage area has 12 luminaires with a power of 60W, and in the production plant 44 luminaires with a power of 134W. The replacing luminaires for LED will be implemented by high performance 27W and 49W luminaires with an equivalent luminous flux. We will not change the position of luminaires. We determine that the plant works for 12 hours a day for 5 days a week. The price of fittings does not include assembly costs.

 

Replacing luminaires for LED - types of lighting fixtures

[1.2] Types of lighting fixtures

 

According to the lighting standards, in the electrical factory should be at least 300 lux with an uniformity greater than 0.6. In addition, we have reduced maintenance coefficient and wall reflections.

 

Replacing luminaires for LED - dialux calculations for electrical industry

[1.3] Dialux calculations for Industry Area

 

We will make similar calculations for the warehouse part in accordance with lighting standards.

 

Replacing luminaires for LED - dialux calculations for warehouse

[1.4] Dialux calculations for Warehouse Area

 

All luminaires will be equipped with an ON / OFF driver and a lifespan of 50,000 hours

 

Replacing luminaires for LED - consumption of electricity
[1.5] Consumption of electrical energy (kW)

 

On the picture we can see a linear growing of electrical energy consumption. After 4 years the consumtpion of traditional light source will be twice bigger than LED .

 

Replacing luminaires for LED - return of investment
[1.6] Return of investment (E)

 

Looking at the chart, we can predict when we can expect a return on our investment costs. Achieving all the assumptions, the replacement of LED lighting will be returned after 3.3 years.

 

3. Conclusions

  • Facility with more lighting fixtures to replace is more proficiency;
  • Using one / two types of luminaires make our lighting system easier and faster to reimbursment;
  • It is noteworthy that most new luminaires on the market have a 5-year warranty, so the degree of risk is small.

It seems that LED technology is¬†profitable and return on investment is relatively short. However, remember to carefully choose LED luminaires. The problem with such replacement may be reactive power which we can deliver to the network and the operator will ask us to pay for it. An important aspect is also the ability to control lighting using the DALI protocol that can further increase our savings. In addition, it is worth paying attention to companies operating in the “Lighting as a Services” formula. They offer a supply of lighting for free, and they only earn on the savings resulting from changing the lighting on the LED. Is there any doubt in your mind, that using LED lighting in your plant is not profitable?

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