US Green Building Council LEED-AP-BD+C Exam - Topic 9 Question 14 Discussion

Actual exam question for US Green Building Council's LEED-AP-BD+C exam

Question #: 14
Topic #: 9

To achieve the Sustainable Sites Credit, Light Pollution Reduction, Option 1. BUG Rating Method, projects must demonstrate:

AAll luminaires have full cutoff fixtures

BAll luminaires are mounted at least three mounting heights from the lighting boundary

CAll luminaires have a minimum color temperature of 3500 K

DAll luminaires meet acceptable fixture ratings for the project's Model Lighting Ordinance (MLO) lighting zone

Show Suggested Answer

Suggested Answer: D

Detailed

Under the BUG Rating Method, all luminaires must meet acceptable fixture ratings (Backlight, Uplight, and Glare ratings) for the project's Model Lighting Ordinance (MLO) lighting zone. This ensures compliance with LEED's Light Pollution Reduction credit by limiting light trespass, reducing glare, and preserving night sky quality.

by Theresia at May 04, 2025, 03:06 PM

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Dorethea

2 months ago

Wait, does that mean we can't use any decorative lights?

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Elza

3 months ago

Totally agree, it's crucial for reducing light pollution.

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Gayla

3 months ago

All luminaires need to be full cutoff fixtures!

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Wei

3 months ago

Yes, and they must follow the Model Lighting Ordinance too!

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Ollie

3 months ago

I thought 3500 K was too warm for outdoor lighting?

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Alisha

3 months ago

I think the Model Lighting Ordinance is crucial, but I’m not clear on whether it’s about fixture ratings or something else entirely.

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Mona

4 months ago

I feel like the color temperature is a factor, but I can't remember if 3500 K is the minimum or if it was higher.

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Deandrea

4 months ago

I remember something about mounting heights being important, but I can't recall if it's specifically three heights or if that was for a different credit.

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Chanel

4 months ago

I think it's about ensuring that the fixtures don't emit too much light upwards, but I'm not sure if it's all about full cutoff fixtures or something else.

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Lettie

4 months ago

I think the best approach here is to focus on the fixture ratings for the MLO lighting zone. That seems to be the most important requirement, so I'm going to select option D and move on to the next question.

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Valentin

4 months ago

Wait, I'm confused. Is it just about the color temperature, or do we need to consider the mounting height and fixture ratings too? This question is kind of tricky, I'm going to have to think it through carefully.

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Emelda

5 months ago

Okay, I've got this. The key is that the luminaires need to meet the acceptable fixture ratings for the project's MLO lighting zone. That's the right answer, I'm confident about that.

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James

5 months ago

Ugh, I'm not sure about this one. Do we need to make sure all the luminaires have full cutoff fixtures, or is that just one of the options? I'll have to re-read this a few times to make sure I understand.

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Lauran

5 months ago

Hmm, this seems pretty straightforward. I think I'll go with option D - the luminaires need to meet the acceptable fixture ratings for the project's MLO lighting zone.

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Nadine

8 months ago

I believe the correct answer is D as well, it aligns with the requirements for the Sustainable Sites Credit.

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Berry

9 months ago

I'm not sure, but I think A could also be a possibility.

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Marla

9 months ago

I agree with Celeste, D makes sense because it mentions the Model Lighting Ordinance.

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Celeste

9 months ago

I think the answer is D.

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Joana

9 months ago

I believe the correct answer is D as well, it's important to meet the fixture ratings for the project's lighting zone.

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Donette

9 months ago

I'm not sure, but I think A could also be a possibility.

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Virgilio

9 months ago

I agree with Bette, D makes sense because it ensures the luminaires meet the necessary standards.

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Lorean

9 months ago

A) All luminaires have full cutoff fixtures. Ah, the old 'full cutoff' requirement. Gotta love those lighting professionals and their obsession with light pollution.

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Carlee

9 months ago

I wonder if the 'Model Lighting Ordinance' was written by a bunch of astronomers who just want to keep the night sky clear for their stargazing.

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Chantell

8 months ago

C) All luminaires have a minimum color temperature of 3500 K

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Shakira

9 months ago

B) All luminaires are mounted at least three mounting heights from the lighting boundary

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Ethan

9 months ago

A) All luminaires have full cutoff fixtures

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Bette

9 months ago

I think the answer is D.

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Tonette

9 months ago

Wait, is the 'BUG' rating method referring to the actual bugs attracted to the lights? Because that would be a whole other level of sustainable design.

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Brandee

8 months ago

C) All luminaires have a minimum color temperature of 3500 K

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Chandra

8 months ago

B) All luminaires are mounted at least three mounting heights from the lighting boundary

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Fairy

9 months ago

A) All luminaires have full cutoff fixtures

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Dianne

10 months ago

D) All luminaires meet acceptable fixture ratings for the project's Model Lighting Ordinance (MLO) lighting zone. This makes the most sense to me, as meeting the local lighting regulations is crucial for compliance.

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Juan

9 months ago

C) All luminaires have a minimum color temperature of 3500 K

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Gearldine

9 months ago

B) All luminaires are mounted at least three mounting heights from the lighting boundary

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Francisca

9 months ago

A) All luminaires have full cutoff fixtures

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