C 'is a bit' of confusion on the issue dell'UGR. We have been told that the UGR must be less than 19, a bit 'as it is known that the lux on the table must be 500. I doubt that anyone who launches into discussions of these techniques to know exactly what he's talking about.
Here then is an explanation, which I tried to make it as clear as possible.
The UGR is an internationally unified index, developed by CIE (Commission Internationale de l'Eclairage) to evaluate glare direct relation to each specific application. This index assesses the presence of glare in a kind of annoying. It has been introduced by the standard for lighting the interior UNI EN 12464-1, quality class in place of G present in the UNI 10380th, outdated, which employed the curves limit luminance (Söllner Diagram). Its value depends on the arrangement of the luminaires, the characteristics of the environment (size, reflectance) and point of observation operators and ranges from size 10 (no glare) to 30 (significant physiological glare) on a scale of 3 units (10, 13, 16, 19, 22, 25 and 28): the lower the value, the less direct glare.
Typically, each lighting fixture in a room can be arranged as two points of view that are orthogonal to the two main floors and C90 ° C0 ° -180 ° -270 ° (are the plans that are taken as reference for identifying the light distribution) . UGR factor takes into account the background luminance (ceiling, walls) and the sum of the effect of glare each appliance placed in the room compared to a standard position of the observer. Is calculated using the following formula:
- Lb is the background luminance (cd/m2) calculated as Eind / π, where Eind is the indirect vertical illuminance at the observer's eye;
- L is the luminance (cd/m2) of the luminous parts of each luminaire in the direction of the eye of the observer;
- ω is the solid angle (sr) of the luminous parts of each luminaire in the direction of the eye of the observer;
- p is the index position of Guth of each appliance;
- Σ indicates the summation of all the lighting fixtures;
The UGR is not defined for lighting fixtures that have a component of indirect lighting above 65%. Typically a good program of calculation can provide the values of UGR Type in some situations, taking into account the reflective properties of the space (floor, walls, ceiling) of the size of the environment expressed by the difference in height between the eye of 'observer and light sources (H). Often in the catalogs shows its contents UGR of an appliance, so as to provide operators with guidance on the conduct of the lighting body against the glare problem diretto.Se apparatus has its own UGR values below 19 ( !), then it is appropriate for use, for example, in classrooms in general classrooms for art education in the reading rooms, as in these environments limit UGR is, in fact, of 19, but not in classrooms technical drawing, where the maximum is 16. These maximum values are specified by the legislation.
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19. July 2007 at 10:29
not involved much with the post but I have a question for you experts: you think it is possible that the neon lights malfunctioning of the schools I attended could have a negative impact on vision ?????????? will be a coicidenza the fact that he had put his glasses in the spring after spending the winter in the classroom with a baby over my head still on and off? LaPepaTencia
19. July 2007 at 13:13
Well, actually the problem you describe is linked indirectly to the 'UGR, you should know that fact to light up a Room Services and specifically classroom it is necessary to consider not only quantitative parameters in terms of light, even as qualication UGR, uniformity, shades of light and type of source.
As for fluorescent tubes need to know that, especially in old plants, operating at a frequency detectable by the eye (it is perceived as a flicker of light), this phenomenon, if associated with an insufficient lighting can lead to physiological problems
hello hello
20. July 2007 to 17:15
mmm when explaining how you work ... I do not understand anything, and I'm sure'll tell 'something without sense.
In short, I had to wear glasses ... In Sierra Leone's eyes began to burn like crazy, it was believed a combination of factors, tell me if you can 'be: working 10 hours a day with the head attached to a PC and they put me to work in an office with a window behind him, one left and one in front (the office is great as a candy, so it's a window). The office is very white (oil paint, which reflects a lot of light!) I suffered like a snake. Now with my glasses is better, but I did put the curtains everywhere and always raining (atmosphere very dark).
With expert, the next
20. July 2007 at 21:44
Well, then they are probably the fumes of oil painting, white ...:) ... but there is the rainy season ???????!!!
However I think being in the PC all day is the real problem ... especially with LCD monitor
hello
G.
21. July 2007 at 12:25 pm
More LCD for all then !!!!!
Cee hello
19. June 2008 at 06:57
Hello everyone,
I am a student of design & engneering, I'm in internship in China and I have to design an office lamp market euroeo.
I am in difficulty 'in the calculation dell'UGR. I do not know where to begin ...
Above all how do I detect luminance levels?
Someone can 'give a tip?
Forgive the ignorance, but it 'my first project illumiotecnica!
Thanks a lot!
Andrea
19. June 2008 at 16:58
Bha the fastest way is to use a software for calculating any (eg Dialux) (dial.de) constructed a room, and place a test plan UGR
and you're done. Oh course you should have at least the file in Photometric LDT.
what kind of device you are designing??
hello hello
James
1. July 2008 at 09:12
Hello,
a question on the surfaces of calculating UGR Dialux. It can happen that are not values, and min and max are evaluated with this symbol: /?
Thanks
1. July 2008 at 14:16
MHA said it seems to me strange ... you have a room, the lighting fixtures (eye which are below the ceiling) and a plan UGR? and if not from calculations' results?
But the plan calculation gives values of illumination?
let me know
James
1. July 2008 15:42
I always more than a surface calculation UGR (in the same room), and on some of the values I and others do not. or rather, instead of the value of a bobbin, I / ... as if the result would not be "considered".
Maybe if anything does not pass by the viewing angle of the observer, is not rilevato.Non know, it's strange.
Thanks for your answer in the meantime.
Elisa
1. July 2008 at 17:06
So ... should be enough room for a surface that takes account of different points within the environment for hypothetical observers. The important output of that calculation verifies that UGR has lower values than those defined in UNI 12464-1 for every type of visual task.
If you're not the one maybe I can send you extract.
hello
1. July 2008 at 1729
Thank you very much!
The one is there, and all the values that I see are correct and comply with the rule.
I will try to investigate the matter and if they come to hold you head up to date.
Hello
1. July 2008 at 17:57
Perfect!
hello hello
30. September 2009 at 17:33
Excuse me a question ... I often find myself cambattere with pedestrian underpasses which I can not find a clear legislation ... It could take 12464-1 and use the reference 8.2.1, but that legislation requires uniformity of almost 0.7 impossible to achieve in an underpass. Or you could refer to the EC 13201-2 with classes, but this law refers to the lighting of roads and then by what criteria the class when in reality there is a road? Do you know anything about it? For example, what rules to follow for a pedestrian underpass that leads to an underground car park? Or a small tunnel that leads from the street entrance to the station? Thank you.
1. October 2009 at 15:01
difficult question ...
I gave him a bed in a bit of rules and we diresi in the presence of a regulatory hole.
If the work is part of a structure or otherwise asociate already "standard" as a station or similar I believe we can apply the 12464-1 standard.
Different case is a simple sottopoasso pedestrian, who right now would be identified in an S or EC of 13,201, but in my opinion should be a specific document or a supplement to other standards.
Be defined if they are accompanied UNI11248 or to UNI11095 the galleries.
UNI and its working groups the difficult decision
2. October 2009 at 10:41
Excuse the question, but how come you started this discussion on the post below this one 11248th of UGR?
Which inter alia in the formula presented above is representative of a local government?
Hello and see you soon!
2. October 2009 at 10:51
Because there was talk of UNI 12464-1 to which I referred. Look and you can, move the part not suited quietly.
25. October 2009 at 16:53
hello!
I need an info on the calculation UGR with DIALux.
I created the room (with window, furniture and ceiling lamp), then I created a sup. UGR calculation, however, after starting the calculation, the output (graphics UGR values) do not get any value, but two temples like this: / (for min and max).
how do I get a number?
thanks
francesca
25. October 2009 at 18:59
First ... Welcome to Luxemozione!
Regarding Dialux strange ... but you get illumination values? If not, your body may be ill. positioned above the ceiling
At best, send me the file by mail accompanied by photometric do look ...
a presto
G.
25. October 2009 at 21:46
Thank the swift response!
I selected the setting "Ceiling integration" proposed by the program, so I do not think the lamp is above the ceiling.
As regards the values of the Enlightenment, yes.
I get the output values of E min, max, isolines and everything.
regarding the calculations dell'ugr to me it seems as though something is missing ... I tried to put more land (since reading the comment by "Eli" her on some surfaces and other results were the bobbin as I) I changed the direction of the observer, but nothing ...
unfortunately I'm just using the program and are not very practical, maybe I missed some critical step ...
where I could possibly send you the file?
thank you very much!
Francesca
25. October 2009 at 23:01
Uhm ... sending well, although I think might be a problem of photometry, often in the LDT is not inserted and the size of the sup enlightening because, as you'll see in the formula dell'UGR is required luminance light body surface is a glowing as required (recall that L = I / A)
hello
G.
26. October 2009 at 12:57
ok!
But the size of the illuminating body is there, because I used a library DIALux, so the area we would be ...
about the mean curve for photometry Photometric apparatus?
to what address I can send you the file?
hello
Francesca
26. October 2009 at 13:04
Ah, but can be a value so low that the UGR is not even reported?
26. October 2009 at 13:13
Send me everything giacomo@luxemozione.com ... so do 'one eye
When I say I mean photometric photometric file format or ldt ies or similar
hello
4. February 2010 at 15:58
Hello everyone!
I have (hopefully) the last question on DIALux sull'UGR (I'm finishing my thesis, then I swear I will not break more boxes).
I included in my project a surface calculation UGR, and I got the values (isolines UGR), but my question is what those values indicate? indicate the glare which is subject someone to look at that area?
4. February 2010 at 18:52
Hello, index UGR is a value that allows me to assess the glare harassing, precisely to take account of background luminance, luminance of the apparatus, observer position, so that is inserted into the formula above. The software is merely applying for each grid point. The regulations for workplaces 12464th one, he says, inter alia, the maximum that I can have inside the room under the direction of observation set (the red arrow for the grid UGR)
I hope it is clear
Hello
5. February 2010 at 09:29
Thanks again for your speedy responses!
In summary then, considering that the rule says that the background luminance is calculated by the indirect vertical illuminance at the observer's eye, I suppose that in the case of calculating UGR punctual, software, calcolrare the UGR, Take the indirect vertical illuminance at that point, whereas the surface, takes the illumination in each grid point, right?
(obviously the aim of the observer is used to calculate the luminance of the luminous parts of the apparatus in the direction of the eye of the observer, both in the case of UGR punctual than superficial)