visual fatigue and electrical consumption are two aspects to consider before buying it

Gone are the times of TVs with tiny diagonals which also took up a lot of space in our furniture. With the proliferation of flat screens that we can hang on the walls and the permanent drop in prices, generation after generation, the sizes of our beloved TVs have gone growing in recent years.

It is no longer strange to see models of 65, 75 or more inches in stores that are on sale for less than 2,000 euros and of course, we have the doubt of whether it will be worth it buy one of these televisions to have them at home and use them every day.

In the following lines I will try to give you my personal opinion leaving aside the technical part that we always deal with related to whether we can take advantage of pixel resolution and I am going to focus on two aspects that we have discussed in Any occasion but maybe not in depth: eyestrain and energy consumption.

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¿Tele grande walk or walk?

Suppose that the budget is not a problem and that we are going to buy a new TV. We begin to inform ourselves, to ask acquaintances, sellers, we look for tutorials on the Internet and surely many will tell us something like: “Buy the largest that will fit on the wall or in a short time it will be too small for you. “Really? Do you have to buy something that” fits on the wall or the furniture “until it takes up all the space?

I like big, huge, huge screens. In fact, for many years we had a home theater projector system with a 2-inch screen. 106 inches at 2.8 meters distance and HD-Ready and Full HD resolution and it did not seem excessive to me … but for cinema sessions. That is, to watch a movie or two a week during a couple of hours straight and taking into account the low brightness of the projectors, with less than 150-200 actual nits at best.

With today’s TVs that easily exceed the 800-1000 nits and to see conventional content such as talk shows, contests, news, novels, series and also movies, things change and it depends on how long we use our screen.


If we are going to watch TV during many hours a day, having such a powerful light source (yes, I know you can lower the intensity, but it’s still much more powerful than a projector) and so close can cause visual disturbances.

Also, as already we saw in his day, there are studies that tell us how from 60 degrees we begin to lose color perception and at 124 degrees it stops seeing well with both eyes, so there are associations such as the SMPTE that propose to consider a optimal viewing angle of 30 degrees, which restricts the maximum size of the television that we must install at home.

This recommendation also takes into account the effect “tennis match”, that is, we do not have to move our heads continuously to see all the sections of the image on the screen. And the general rule is that the minimum viewing distance is three times the height of the TV or 1.6 times the diagonal of a 16: 9 screen

Thus, for example, for distances of less than 2 meters, a size of up to 50 inches would be recommended, 55 inches are reserved for distances of 2.1 meters, 65 inches is recommended for about 2.5 meters and if we want to put 75 or more inches we should have at least 2.9 meters of distance between the screen and our real position in the room.

Minimum distance = 3x height

TV diagonal

Height in cm

Recommended distance in cm

49 inch



55 inches



65 inches



75 inches



More diagonal means more consumption

One of the factors that we normally do not take into consideration when choosing a television is the energy consumption. We look at the resolution, the brightness, the functionalities, the panel technology, but not whether it uses more or less watts.

However, it is, or should be, a determining characteristic in the case that we are one of those who have the TV on for many hours a day, since especially if we buy a model with a large diagonal, consumption can reach shoot our bill at the end of the month.


If we are one of those who turn on the TV and have it in the background accompanying our activities at home all day for 8 or 10 hours, it is best to choose a model with a moderate size, since in dimensions of more than 55 inches the electrical consumption shoots up.

To check it, we just have to go to the manufacturers’ specifications on their web pages for a specific model and see how the “standard” values ​​(for intermediate use with brightness and luminosity values ​​in the middle range) and “nominal or maximum values. ” grow considerably with the size of diagonal.

For example, with a mid-range LCD-LED TV such as the Sony XG95 we have a standard / maximum consumption of 145/256 watts in 55 inches, figure that amounts to 176/313 watts in 65 inches, 230/371 watts in 75 inches and reaches 282/438 watts in the 85-inch model.

With OLED technology, consumption should drop somewhat more, but the real figures say otherwise. For example with the model OLED AG9 de Sony we have values ​​of 132/394 watts in 55 inches, 169/490 watts in 65 inches and 211/674 watts in 77 inches.

That is, depending on the model we buy, going from a diagonal of 55 inches to one of 75-77 inches can mean close to 70-80% more electricity consumption, something that we will have to consider if we are going to have the TV on for many hours a day.

This consumption also influences the air conditioning of the room. The TV behaves like a small heater on all day which in winter helps to heat the room but in summer fights against air conditioning by raising the temperature of the home and once again increasing the cost of electricity to lower that temperature.

For example, in my house with a TV with an average consumption of about 250 watts in summer easily increases from 1 to 1.5 degrees room temperature, so the air conditioner needs more time and energy to keep the room cool.

So, wouldn’t you recommend a big TV of say 65 or 75 inches for the living room? Well, it depends on the use you are going to make of it. If you want it for occasional or moderate use (less than 3-4 hours a day) to watch movies, play some games, watch a series or even the soap opera and you have enough distance between the TV and the couchGo ahead, it can be a great option.

If on the contrary it is a device that you are going to have all day on and you do not comply with the minimum distance that we mentioned at the beginning, perhaps the best thing to do is opt for a smaller model, you will save money when buying it, you will avoid problems of visual fatigue and you will reduce the electrical consumption lowering the monthly bill.

Source: Xataka Smart Home by

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