Inconsistent lighting fixture render

[steve]

Hello all:

I am using the identical recessed can lighting fixture in two different models. In short, the fixture renders correctly ('illuminated' and throws light) in one model, but not the other. The render settings of the two models are identical, and the lights are turned 'on' as part of that setting for both.

A basic draft mode render or a cloud render yields that same confusing and frustrating result. How is this possible?

Any help is appreciated!

[steve]

Thanks

[barthbradley]

@steve: 

I appreciate the shout out, but I didn’t do anything except render the model you posted.  I did this to show you that your Light RFA renders fine in the project. There’s nothing wrong with it; there never was.  I was dumbfounded that the solution was to move the light outside of the fixture geometry. That’s just plain ridiculous.  The problem was always that something was “blocking” the light (e.g. solid geometry or non-translucent material).

BTW: Revit and Manufacturer light fixture families been developed and tested by people that are experts in their field. To say “98% of light fixture models are garbage” is pure hogwash. 

[Anonymous]

Nah, 98% of Revit light fixtures are badly modeled or have the wrong IES/lumen information.

Also, Revit does not support LED IES files yet, they have to be manually modified to work properlly and not render rainbow colors.

For example, all Revit OOTB architectural families for lights are not using an IES distribution file. So they are all uselees ofr photometric/realistic analysis. Interestingly enough, all the OOTB engineering families seem to have IES files associated with them, but they are using Watage/efficacy, whish is totally useless, they should be using Lumens based on the same lumen value as the IES file.

If there's one area in Revit where I'm 99% confident, it's lighting. I've done lighting design in BIM for two years, and I've seen the disasters that manufacturers produce. It's really rare the see fixtures properlly modelled to be photometrically accurate. For example, most manufacturers assume that Revit reads the lumen values from the IES file and leave the default lumen value. Then again, there are no good rescources for lighting designers doing BIM.

Anyhow, rant over.

[barthbradley]

@Anonymous: No rant taken. I appreciate your feedback - and I trust it. You obviously have an expertise I don't.  I guess it's subjective. 98% bad for your purposes; 98% good for our purposes. 

Thanks.