Office: is it worth converting from louvre luminaires to LED-panels? 21332 back to overview

Office: is it worth converting from louvre luminaires to LED-panels?


Ideal office lighting is a crucial factor for a productive, efficient and particularly healthy working environment. That raises a lot of questions: what are the criteria and parameters for right light? Which requirements and regulations need to be considered? When is it worth to switch to LED?

We have carefully examined all these questions for you!

What is the decisive factor for efficient office lighting?

Proper office lighting plays an important role for health, performance and well-being of your employees. Therefore, standardized features need to be considered for correct office lighting.

On the one hand, attention should be given to luminance intensity, measured in Lux (value of luminance intensity). Office workstations should be illuminated with 500lx at least. Dimmable lamps are offering more individuality enabling each employee to adjust light to his personal desires.

Right choice of light color is vital. Light color is consisting of color temperature and color rendering index. Neutral white light having a color temperature between 3.300 and 5.300 Kelvin is offering an unemotional working atmosphere enhancing concentration. Parameter of the color rendering index should be at least CRI 80 to reflect natural colors most similarly.

Illumination of office spaces should be glare-free for good concentration and undisturbed work activities. In addition, office light should not flicker – flickering is not only irritating but also causes headaches.


Is it worth converting to LED-lamps?

For giving an answer to this question, louvre luminaires in an office with about 30m² have been replaced by LED panel luminaires. It was our objective to obtain an illumination working independently from one another for two workplaces.

Lighting and costs have been carefully analyzed before and afterwards on the following basis:

  • Number of luminaires
  • Uniformity of luminance
  • Consumption of energy
  • Investment costs
  • Time and effort for exchange


Any improvement of light after exchange in favor of LED lamps?

Summing up the situation: Office with six louvre luminaires each having four 18W FL-lamps installed in an Odenwald (OWA) ceiling system. They have been replaced by eight Trilux Siella LED-panel luminaires to illuminate the workplaces independently from one another with four luminaires each.

Prior to change, light intensity was as follows:

light intensity prior to change

Unbalanced light distribution between the two workplaces was most conspicuous as well as the difference in illumination between the various points of measurement. In addition, it was not possible to have separate and individual lighting for the two workplaces.

After switchover the scene was completely different:

light intensity after change


Well-balanced illumination of the two workplaces. Difference in illumination between the various points of measurement was considerably reduced. Installation of four panels for each workspace offers separate and individual lighting independent from one another.

The difference between luminosity and uniformity of luminance is evident:

Before: perceived office lighting

After: perceived office lighting

Improvement of office lighting is not only measurable but also perceptible.

Please have a look on this video well illustrating the good results of Trilux Siella compared to other LED panel luminaires:


Does a changeover to LED make sense for my office?

LED luminaires considerably use less energy than fluorescent lamps. However, time for giving good return of investment for a change to LED depends on the quantity and time duration of switching on the light.

For lighting of a storeroom into which you enter just once a month, buying of a LED luminaire generally pays off only after a long time (if at all). Regarding LED lighting for offices, doctor’s surgeries or other places of work, but also living spaces, investment is already redeemed after some few years in most cases.

TRILUX Siella LED which we have chosen for replacement of the louvre luminaires have an energy consumption of 31,7 Watt. The former louvre luminaires had fluorescent lamps of 4×18 Watt – consequently an energy consumption of 90,1 Watt for each luminaire.

Energy consumption before

Energy consumption of the LEDs







Comparison of total consumption including energy costs: 

louvre luminaire new LED-Panel
power consumption in watts 90,1 W 31,7 W
consumption of all luminaires in watts 540,6 W 253,6 W
consumption per day in kWh (8h) 4,32 kWh 2,05 kWh
consumption per year in kWh (220 workdays) 950,4 kWh 451,00 kWh
energy costs per year (0,3 €/ kwH) 285,12 € 135,30 €

Taking a kilowatt price of 30ct and an average use of the office spaces (8h per day, 220 working days per year) you can save over 50 % of your energy costs.

What about the investment costs?

Obviously, investment costs depend on the price of the new LED luminaires. Meanwile, high-grade LED with excellent light quality are available at reasonable prices.

Saving over 50 % in energy, new lighting pays off after a few years already. In addition, a considerably higher life cycle must be taken into account. Fluorescent lamps have an average life cycle of 11.000 hours – LED with 50.000 hours nearly five times that amount.

Working time for installation still needs to be considered. In case of our example for the Odenwald (OWA) ceiling system, time just took about 30 minutes – more than manageable!


You want to save even more money?

No problem!

In connection with a light management system, even more energy can be saved. Easy and fast control systems offer highest comfortable handling and utmost flexibility!

We recommend the light mangement system by Casambi. Small modules are connected with the luminaire offering immediate and easy control and dimming by using the Casambi app. Free of charge and simply via Bluetooth.

For more information, please do not hesitate to visit our Casambi theme-related page.