- #1
Howlin
- 55
- 0
Hi all,
I am not sure this is meant to be a part of the forums but if it is to be changed, please let me know. This is not a homework question but more of a (weird) curiosity question.
I was looking at the different lighting classes that are out there for roads and have noticed that the lighting levels for this vary depending on what type of road and its usage. I was looking through the British standard for public lighting and for Motor traffic zones it shows for a zone it has to have an average road surface Luminance L (bar) of 2.0 cd/m2. I then saw that for a conflict zone the average illuminance E (bar) for a zone must be 30 lux.
I have looked up what luminance and illuminance is: In a nutshell, Luminance is the amount of light given off a surface while illuminance is the amount of light hitting the surface.
I know the equation for illuminance is E=I/D2 or E= I*Cos3θ / D2.
Is there any way to convert illuminance (e.g. 30 lux) to luminance (e.g. 2.0 cd/m2 ) or vice virsa?
I am curious in knowing if there could be much of a difference between the lighting levels for a conflict zone and non conflict zone.
(I know I have a weird curiosity)
If my equations or definitions are wrong, please tell me.
Thank you,
Stephen
I am not sure this is meant to be a part of the forums but if it is to be changed, please let me know. This is not a homework question but more of a (weird) curiosity question.
I was looking at the different lighting classes that are out there for roads and have noticed that the lighting levels for this vary depending on what type of road and its usage. I was looking through the British standard for public lighting and for Motor traffic zones it shows for a zone it has to have an average road surface Luminance L (bar) of 2.0 cd/m2. I then saw that for a conflict zone the average illuminance E (bar) for a zone must be 30 lux.
I have looked up what luminance and illuminance is: In a nutshell, Luminance is the amount of light given off a surface while illuminance is the amount of light hitting the surface.
I know the equation for illuminance is E=I/D2 or E= I*Cos3θ / D2.
Is there any way to convert illuminance (e.g. 30 lux) to luminance (e.g. 2.0 cd/m2 ) or vice virsa?
I am curious in knowing if there could be much of a difference between the lighting levels for a conflict zone and non conflict zone.
(I know I have a weird curiosity)
If my equations or definitions are wrong, please tell me.
Thank you,
Stephen