Detalhe do Artigo
In the 1980s, there was a standard that determined the amount of luminance for sports, including in soccer stadiums. Currently canceled, this standard is only valid as a reference, but is not a parameter, since there was no television broadcast, so it is totally out of date. The maximum required at the time was 300 lux for professional use, already today with television broadcasts in HD / 4k in high image quality is required on average 2000 lux, which is absurdly more.
The references used today are guidelines of the football federations. If the International Football Federation (FIFA), for example, determines that the stadiums that will host the World Cup matches to be televised must have 2000 lux of average luminance, so that's what follows. However, there is no specific requirement, there are federations that indicate their need, because this amount of lux is more due to the transmission on TVs than for the game itself.
In order to guarantee homogeneity and at the same time a high level of illumination, one has to work with several different angles of beam. Usually we work with 19 ° and 56 °, due to the great distances of the posts to the lawn. In addition to the uniformity and level of illumination, a project well done from the point of view of glare is very important. The level of glare rating should be low to avoid the discomfort of the players and also to avoid problems with the television broadcast.
In addition, it is necessary to pay attention to the color reproduction (IRC) that, as a rule, has to be above 80. The closer to 100, the more real the color is, taking into account that 100 corresponds to the Sun. The lighting in LED offers a reliable illumination to which would be seen the sunlight precisely because of this index, this means that the bigger the IRC, the better. In comparison to a sodium vapor lamp - yellowish ones - for example, you see a color that is not exactly that color, because the IRC of it is very low.
The use of LEDs is always indicated when reducing power and heat points. In a mall, for example, it is very indicated because it has central air conditioning and if you have many hot spots - that is the lighting - you will need to generate more air conditioning flow to maintain the temperature. If the LED was used in this lighting, a lamp that would work at 80 ° C will work by emitting less temperature into the environment and requiring less of the air conditioning, and thus less consumption.
On the other hand, already for the soccer stadiums the question is of power and maintenance. LED luminaires have longer durability and require less maintenance, as well as being more reliable in color reproduction than ordinary sodium vapor lamps. This is not to mention the average economy, which is 60% in installed load, that is, lower total power of the luminaires is used to achieve the same lighting result, compared to a project with other types of lamps.
This calculation is made from the comparison between two equal scenarios in which only the type of lighting changes. The reduction of installed load generates savings in energy consumption, but also generates savings in electrical installations such as cables, transformers, switches, busbars, etc. As pointed out, investment in LED is undoubtedly the best option for football stadiums, given the economic and long-term benefit.
* Rodrigo Travi is CEO and Commercial Director of LEDAX. He is a serial entrepreneur and holds a degree in Electrical and Electronic Engineering from the Federal University of Bahia