Measuring 3: videos
Usually moving pictures are broadcasted on LED walls. With the knowledge we gained from our other tests we now want to form a hypothesis that usual videos show a white content between ¼ and 1/16 and according to this consume little energy.
To check this thesis and to eventually set up a realistic cost accounting by means of our data, we have played eight different, 30-minute long YouTube videos in random order and different brightness levels nonstop for several days and measured the energy consumption.
During our long-term test, our videos have consumed on maximum brightness on average 175 watt per hour. In our conclusion we want to go into were this result needs to be filed and what this means for a realistic calculation of costs.
Conclusion and cost calculation
The white content of our LEDBRIX wall plays a more important role than the brightness when it comes to the calculation of the operating costs. The theoretical maximum consumption of our wall does not mean anything here. It can only be reached by displaying pure white at maximum brightness – a scenario that could not be further away from practice.
The average value that is noted on the data sheets of the hardware often does not represent a realistic scenario. To reach this value one would have to display the white mug from our previous example on the LED wall permanently.
Usually on our LED walls only video sequences and animations are played. Our long-term test with different videos in common format showed that per square metre circa 175 watt per hour are consumed – at maximum brightness. In the following calculation example, we start from an average brightness of 50%, a realistic average value. In the morning and evening hours the brightness can usually be set to a significantly lower level, during the day and with lots of sunshine more than 50% could be necessary.
In the following cost calculation, we start with a 15 m2 wall that is in use from 6 AM until 11 PM at an average of 50% brightness.
Under these conditions, the wall would be running on average with 114 watt per square metre and hour. Converted to 15 m2 this makes 1.71 kWh. With 17 operation hours per day 29.07 kW would be used. With an electricity price of 0.25€ the operation would cost around 7.30€ per day.
The standby mode would cost around 20 cent per hour – the whole night (11 PM – 6 AM) therefore 1.40€.
In our scenario, operating the 15m2 LEDBRIX wall would cost 261€ per month. One could save 42 Euros if the wall was switched of completely when not in use.
Energy saving options
We learned that the white content of the displayed contents is an important factor when it comes to the power consumption of our LEDBRIX wall. The higher it is, the more energy is consumed. When a wall is used outdoors with direct sunshine, the brightness level often needs to be set higher so that the contents are visible clearly. With few sunlight or at night, it can be adapted correspondingly. The cost difference in operation on different levels of brightness, however, keeps within limits. This is made clear in the following listing.
There are several options to control an LED display effectively and with this lower the operating costs:
- Work without stand-by: usually switching off the software solely deactivates the playback of the contents – the display would therefore be in stand-by mode. Adding a real on/off system saves energy additionally
- Time programming: by using a timer, operating hours and (according to time of the day) the brightness of the wall can be programmed in order to save energy
- Sensors: to reach maximum efficiency, the brightness control of a LED wall can be automated completely. Here, light sensors measure the according brightness of the surroundings and adjust the display brightness of the LED wall by using a software.
You have questions concerning the efficient operation of LED walls or are interested in one of our products?
You are welcome to give us a call at +49 551 492 493 44 or send an email to firstname.lastname@example.org. We are happy to help you!
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