Forums >> Revit Building >> Technical Support >> Dim Light Setting for Rendering is Not Functional

Dan7777

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Joined: Sat, Dec 7, 2013
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Hello, I've experienced this problem many times and have tried numerous strategies as well as read both autodesks and any other available literature i've found in order to trouble shoot this problem but nothing has been ultimetly helpful. If someone can shed some light on this problem it would be very appreciated.

So Im trying to render a scene. Specifically a kitchen, and I have included lighting above the countertops. My goal is to render this kitchen with these lights dimmed seeing as they are unrealistically bright. I went to the render settings for the view, selected artificial lights, then grouped the counter lights, then dimmed them to 0.5. As soon as I exited the render setting dialogue, and re clicked the render setting dialogue again to view my settings I had just made, everything was erased including the grouping of the lights. From there I figured another setting was conflicting with the render settings so what I did was opened up the graphic display options for the view and did the exact same thing...grouped the lights, and dimmed them to 0.5. I realized this worked and the settings did not disappear. So then I went into the render settings again and realized the settings I had made in the graphic display dialogue for the view had copied over to the render setting. Great. Wrong... Because after rendering none of my dimming settings made any effect on the render and everything was still as bright as before... So I in an attempt to see if anything was infact happening. Put the dim to the lowest possible setting..but as suspected there was no effect to the brightness of the lights.. I also want to note that I have changed the light intesity and power in the family parameter settings for the light family themselves but still no effect to the brightness of the lights...

If someone can help me here that would be outstanding. This is a huge inconvenience. And has wasted countless hours. 

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pijpiwo

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Joined: Fri, Sep 3, 2010
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Is it happening for all the lights, or just that one family? Can you upload this troubled light family, so we can take a look?

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Dan7777

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In order to help any future people struggling with this issue, I felt inclined to provide some additional information given my current expertise operating Revit. 

I can shed light on several issues concerning lighting within Revit. Primarily due to the fact that Revit lacks in its ability to photorealistically represent lighting through physically (physics**) accurate representations, lighting tends to be distorted from the "Realistic" figures that are entered into the paramaters available for lighting. I am refering to luminosity, wattage, etc.. What this means is you will likely need to distort the settings to achieve the desired effect. For example, if your lights are not bright enough you might rediculouslly increase the wattage to a figure that would be inexistant in real life yet you may find that by doing this you can begin to expect the approprate lighting conditions for your render. "hacking" the settings so to speak may be your only solution unfortunetly in many cases from my experience. 

On the other hand a program such as 3dsmax is better suited to calculate the accurate conditions for lighting and I have found that manufacturer specified paramaters have been reflected appropraitely without any adjustments by me unlike within revit. 

Please be aware that any changes made to lighting paramaters in the type properties of your lighting will be reflected in your scheduling. So if you input 500watts in order to brighten your lights, your schedules will reflect 500watts when the product may only be available in 100watts. This means that for scheduling purposes you will need to change the settings back to manufacture specifications in order to represent the paramaters realistically. 

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tim123

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Joined: Tue, Apr 12, 2005
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I have found that the lights are not realistic in Revit in terms of wattage and intensity.  So if I need a rendered image I will adjust the settings accordingly to create the lighting/mood that I require.  This results in unrealistic power settings.  You could include a conversion factor in your schedule to bring the power setting to a realistic value if required.

In the end, Revit is not a lighting software, and specialist software exists, used by consultants to show the true lux levels with the actual wattage levels.

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