Hello,
I'm doing some calculations in DIALux.
I need to calculate vertical plane at eye level(1.2m) of the occupant.
Is that the same as vertical illuminance in DIALux?
What is the difference between vertical illuminance and perpendicular illuminance?
Thanks.
Vertical illuminance
Re: Vertical illuminance
Hello dodos880125,
We would like to give you some general information about the calculation surface and its parameters:
The workplane is implemented according to the standard EN124641. You cannot change the parameters of a workplane as they always should be adaptive calculated. So a grid of some points are not defined in this way. It is not possible to change the workplane to a calculation surface.
While a certain grid is used for the different measured values it can always be that some minimum or maximum is between those two points. To pretend this you can choose this parameter “perpendicular illuminance adaptive” for calculating on a surface. Then the value to be determined is not defined on a fixed grid but dynamically in the positions where relevant changes take place.
So, adaptive means a dynamic adaptation of the measuring grid. The number of measuring points is dynamically adjusted in such a way that the minimum and maximum values of the illumination intensity are detected as far as possible. This is useful if there are large differences in the illuminances on the surface. The set number of measuring points therefore only affects the other parameters.
The perpendicular calculation parameter is always perpendicular to the surface, regardless of how the surface is positioned. If the surface is vertical, then both parameters are identical horizontally and perpendicular. As soon as the surface is inclined, however, this is no longer the case.
Under the following link you will find some information about the calculation objects and their parameters:
https://evo.supporten.dial.de/support/ ... ionobject
Best regards,
DIAL Support Team
We would like to give you some general information about the calculation surface and its parameters:
The workplane is implemented according to the standard EN124641. You cannot change the parameters of a workplane as they always should be adaptive calculated. So a grid of some points are not defined in this way. It is not possible to change the workplane to a calculation surface.
While a certain grid is used for the different measured values it can always be that some minimum or maximum is between those two points. To pretend this you can choose this parameter “perpendicular illuminance adaptive” for calculating on a surface. Then the value to be determined is not defined on a fixed grid but dynamically in the positions where relevant changes take place.
So, adaptive means a dynamic adaptation of the measuring grid. The number of measuring points is dynamically adjusted in such a way that the minimum and maximum values of the illumination intensity are detected as far as possible. This is useful if there are large differences in the illuminances on the surface. The set number of measuring points therefore only affects the other parameters.
The perpendicular calculation parameter is always perpendicular to the surface, regardless of how the surface is positioned. If the surface is vertical, then both parameters are identical horizontally and perpendicular. As soon as the surface is inclined, however, this is no longer the case.
Under the following link you will find some information about the calculation objects and their parameters:
https://evo.supporten.dial.de/support/ ... ionobject
Best regards,
DIAL Support Team

 Posts: 8
 Joined: Thu May 07, 2020 4:39 pm
Re: Vertical illuminance
Hello,
I'm very sorry that I can't understand the definition.
Can we just make things simple?
If I want to calculate the illuminance on the vertical plane at the occupant’s line of sight (1.2m) which function
I can use?
Is it vertical illuminance? And what is height offset and rotation do on calculation? Thanks.
I'm very sorry that I can't understand the definition.
Can we just make things simple?
If I want to calculate the illuminance on the vertical plane at the occupant’s line of sight (1.2m) which function
I can use?
Is it vertical illuminance? And what is height offset and rotation do on calculation? Thanks.
Re: Vertical illuminance
Hello dodos,
in your case you can use the perpendicular and the vertical!
The only difference is the description of your calculationsurface in the documentation ("perpendicular" or "vertical").
To check the direction of your calculation:
Helpful is here the 3Dview. After clicking on the calculationsurface you see a little orange arrow which shows your calculation direction.
Regards!
Lukas
in your case you can use the perpendicular and the vertical!
The only difference is the description of your calculationsurface in the documentation ("perpendicular" or "vertical").
To check the direction of your calculation:
Helpful is here the 3Dview. After clicking on the calculationsurface you see a little orange arrow which shows your calculation direction.
Regards!
Lukas
Lukas Hünting

 Posts: 8
 Joined: Thu May 07, 2020 4:39 pm
Re: Vertical illuminance
Hello Lukas,
Thank you so much!
I totally understand now.
Best,
dodos
Thank you so much!
I totally understand now.
Best,
dodos
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