Is measuring LUX in a model possible?

baz

quote from AdamB "This mode is useful for determining how effective self shadowing architectural features are working in keeping surfaces cool."

I assume that that this works for 'hot' too?

And I have to agree with Thomas, not much info on your website.(And I did sniff around.)
I am a bit wary of of having to learn a whole new app without knowing what I am letting me self in for.

And perhaps i have'nt been clear about what I'm after, I would like the actual numbers relating to LUX. Purely in regard to how much light a plant might receive from normal daylight. (Thru a skylight for example.)
Along with the time/date and how much extra light energy it might require to be healthy.

If I understand lux at all, it's all about angles (and mathematics, at which I am not at all good at. I am, however, reely good at grammer tho:)
Anyway, it's all good.
baz

it's all about the angles it's all about the angels

AdamB

Yes, LightUp will give you amount of energy falling on the surface as well as a pseudo color image which can help quickly identify problem areas. You can get exact readings using the lightmeter inside LightUp.

It won't give you how much energy you need to make plants healthy.

So with a model like that, based in Boulder, CO on 1st December, the wall gets just 0.11 Kwh/meter/day:

whereas on 24th July, it gets 1.27 Kwh/meter/day:

remus

With regards to having to learn a new app, if youve already got a bit of experience in rendering you shouldnt have any problems with lightup.

solo

Baz, sorry for being off topic, I just wanted to show you a restaurant chain here in Texas that uses their roof as a garden, a company I previously worked with had a maintenance contract with a few of them.

dylan

It is really interesting to see Lightup can do this.
I'm not sure how I can use that in my workflow, but it seems a very useful tool.

museummaker

This thread is of interest to me. I design museum exhibits where lux / foot candles on the artifacts is very important to the curators. Is it possible to model LUX in an interior model based on the lighting in the exhibit gallery?

If it can, it means I could spec lighting fixtures in the design.

AdamB

@unknownuser said:

This thread is of interest to me. I design museum exhibits where lux / foot candles on the artifacts is very important to the curators. Is it possible to model LUX in an interior model based on the lighting in the exhibit gallery?

If it can, it means I could spec lighting fixtures in the design.

Yes, LightUp can produce Lux contour maps below in which there is a variety of IES light fittings being used:

That red spot has a reading of 780lx, whereas the others are a more reasonable 170-200lx

Adam

baz

@adamb said:

Yes, LightUp will give you amount of energy falling on the surface as well as a pseudo color image which can help quickly identify problem areas. You can get exact readings using the lightmeter inside LightUp.

It won't give you how much energy you need to make plants healthy.

So with a model like that, based in Boulder, CO on 1st December, the wall gets just 0.11 Kwh/meter/day:

whereas on 24th July, it gets 1.27 Kwh/meter/day:

Thanks Adam, it's looking interesting, when I mentioned 'light energy' I meant the actual lights which might need to be installed to supplement the existing natural light.
The usual method, as I understand it, of presenting lux info is to spreadsheet it, ie: four columns dividing the year into quarters, each column showing lux for 2/3 times of day. It would be great to be able to present this graphically as you have shown, but you would still need the numbers. Would this be a lot of work in Lightup?
baz

baz

@remus said:

With regards to having to learn a new app, if youve already got a bit of experience in rendering you shouldnt have any problems with lightup.

Total experience is a couple of months with Twilight after several failed attempts to come to grips with some of the others. (Kerkythea baffled me and I didnt get much past screenshots with the other ones

But the way this thread is going I might have to bite the bullet with lightup.
baz

baz

@solo said:

Baz, sorry for being off topic, I just wanted to show you a restaurant chain here in Texas that uses their roof as a garden, a company I previously worked with had a maintenance contract with a few of them.

Hi Solo, that looks good.
Fytogreen do roof gardens as well as the vertical variety.
The thing with the Fytogreen system is the use of a water and nutrient retaining sterile foam which weighs very little which means roof structures etc dont have to be engineered for huge loads. Off the top of my head, a sq metre of fully saturated media with plants weighs 40kilos, a significant weight saving over soil.
baz

If you are interested here are the links:
http://www.fytogreen.com.au/Fytowall
http://www.fytogreen.com.au/roof_garden_systems

Didier Bur

Hi,
You can also try Dialux (freeware)
http://www.dial.de
Export your SU models to 3DS and here you go.
Regards,

baz

@didier bur said:

Hi,
You can also try Dialux (freeware)
http://www.dial.de
Export your SU models to 3DS and here you go.
Regards,

Thanks for the link Didier, I will have a look.
baz

charly2008

Hi,

I have a question about IES Lights. On the Internet there are many catalogs with IES Lights. Is there a possibility to use it in Sketchup and Kerkythea? I've only used the KT-Lights in the plugin folder.

Karlheinz

thomthom

Moved the thread to the Developer's forum. We have reorganized so that the Plugin section is only a list of plugins you can download and use.

minguinhirigue

I am quite impressed seeing how lightup have improve since the first time I use it...

I guess I should try it again, but metropolis render give me very good results in Kerkythea and podium.

Adam, is it possible to extract some insulation numerical values (eg : on a desk) after the calculation ? I would like to use it in a lighting optimization script.

AdamB

@minguinhirigue said:

Adam, is it possible to extract some insulation numerical values (eg : on a desk) after the calculation ? I would like to use it in a lighting optimization script.

Yes, in that you can call the LightUp functions from Ruby to generate "spot" results at locations you choose. ( view.spotlux(x,y)) but really we should have a proper report generating framework.

What kind of information / format are you looking for?

Adam

wind-borne

Just downloaded LightUp , question about Lux.

Does the default extinction(0.5) give proper insolation values for daily sunlight output?

AdamB

Short answer: Yes, within the limits of the insolation model used. Essentially the interaction in the atmosphere are so complex that researchers have produced numerous models that try and capture essence of the issue without going nuts. Its a surprisingly tricky subject.

Long answer: LightUp insolation calculations use the Kasten & Young variable airmass model based on a nominal 1366 Joule/sec. In reality the amount of absorption due to the atmosphere varies with the cloud cover / haze which is represented in by a "coefficient of extinction". 0.1 would be a super clear non-hazy day. 0.8 would be overcast day. 0.5 represents some middle ground representing absorption and reflection in the atmosphere as the sunlight passes through to the ground.

LightUp takes account of geo-location in determining daily insolation and the Kasten & Young model does a good job at modelling the curvature of the Earth and thus sunlight passing through a larger "slice" of atmosphere. And of course LightUp itself occludes the sunlight using your model over a 24 hour period. Together these give a good estimation of available energy on a surface - significantly better than the very broad rules of thumb you'll find in many solar energy modelling packages.

So the Extinction coefficient is something that needs tweaking to reflect the general expected weather for your location, but it is more a fine adjustment. The general picture you'll get with leaving it 0.5 should be fine.

Adam

wind-borne

Thanks for explanation, I had tried 0 and 1 and realized I didn't understand.
Out here in the middle of the ocean in the tropics 0.35 aligned with insolation charts (5.6KWh/m sq./day) for Feb., facing South/latitude tilt.
real world translation for power produced by the panel under cursor on Thurs.
Island has many microclimates and we have well over a thousand microinverters installed at about 50 locations islandwide, most of which I made quick preview models of. So I do have data to tweak.

Thanks, again

Enlighten Microinverter.png

AdamB

Cool.

At the risk of stating the obvious, the energy falling on a surface (available energy) will be much larger than what you can actually produce - as is born out by the measurements you show.