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NC-v4 SSc6:Light pollution reduction

Adjustable luminaries tilt - Option 1 (BUG) Vs Option 2 (Calculation)

Hi, 

I would like to clarify how to characterize adjustable luminaires. 

I the LEED guide, p.212 (Step 7. Gather data on luminaires, Option 2) it is written: 'Show the total lumens per luminaire and lumens emitted above horizontal by each luminaire (lamp-ballast combination) for the orientation and tilt specified in the project design'.

On the other hand, on the p.215 (Choosing Luminaires) it is stated that: 'Luminaires with limited field adjustability must be assumed to have maximum tilt applied and lumens at or above 90 degrees must be calculated from maximum tilted orientation. To more easily meet the credit requirements, avoid adjustable luminaire types as a primary lighting source'.

Does this mean that if I have an adjustable luminaire, and choose Option 1 (BUG rating), the worst case tilt scenario has to be used for calculation of the BUG rating, but when choosing Option 2 (Calculation), it is fine to use the tilt as specified in the design brief? Or has the maximum tilt of the adjustable luminaire be applied regardless of the calculation method?

Many thanks for sheding some light on this.

Anna

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Bill Swanson
Sr. Electrical Engineer
Integrated Design Solutions
LEEDuser Expert
516 thumbs up

Tue, 07/07/2020 - 15:10

No, worst case scenario (max tilt) for both options.

BUG ratings don't work well for adjustable lights.  I don't even know how to accurately obtain the BUG rating at an angle.

If the tilt goes much beyond 10-15 degree tilt it's probably going to have way too much uplight.
 

Tue, 07/07/2020 - 15:28

 Lighting Analysts Toolbox or others software allow to change tilt of existing IES file and get new BUG rating for tilted luminaire

Tue, 07/07/2020 - 15:29

Hi Bill, thank you for the prompt answer, understood.  Frankly speaking, it seems to be a little bit too strict to us that Architect/Lighting designer is limited in the choice of the luminaires by the worst case tilt (I am considering a scenario where the light is lets say at least 2m high and the angle is firmly fixed against accidental move, i.e. by a bolt).  Hence I decided to check our understanding. Thanks again, Anna 

Tue, 07/07/2020 - 15:31

Hi Michael, thank you for pointing to the Lighting Analyst Toolbox software, good to know.

Mon, 04/24/2023 - 14:50

Hallo everyone,  I am using Visual Photometric Tool to calculate the BUG Rating. But I realised that I cannot tilt the luminaires? Is there a way to do that?  In my case , I have Street Luminaires and I want to check if tilting 5 degree does have an effect on the back light. ( I am in the process to download the Lighting Analyst Toolbox software, but it is a trial version as far as I see) Thank you in advance, Josef Nassif

Mon, 04/24/2023 - 15:34

I believe that you can tilt the fixture and generate a new BUG rating using AGI software from Lighting Analysts

Mon, 04/24/2023 - 16:13

Thank you for your feedback Glenn, but I guess we need to buy it. ( The trial version is not working with me...)

Mon, 04/24/2023 - 20:01

Josef, I'm sorry, I don't think you can do it in AGI, but you CAN do it in Photometric Toolbox Use the "Convert" tool in the tools menu. Then check "modify luminaire test position" and enter your tilt angle. It will make a separate copy of the file with the new angle. If you generate a "Road Report" you will see the BUG rating

Tue, 04/25/2023 - 06:27

hey Glenn, yes I noticed :) It seems really cool tool. ususally we use this : https://www.visual-3d.com/tools/photometricviewer/ but I didn`t manage to tilt the Luminaire. I will try the Photometric Toolbox from AGI. have a great day 

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