HOW MANY LIGHTS FOR A FOREST VIBE?

Step 1:

To figure out how many lights are needed for a forest lighting vibe, we'll need to do a quick calculation. It only takes a couple minutes.

First answer the questions in the table below. You'll need to know what kind of room is being designed, how large the room is, and how bright the room finishes will be (walls, floor, and ceiling). By using the estimator you are acknowledging that you agree to the terms and conditions (link here).

Once you've done that, the estimator will automatically tell us how many lumens of light we need for that room.

LIGHTING ESTIMATOR: FOREST VIBE

Step 2:

Email yourself the results from the estimator so that you have it for your records.

Step 3:

Now that we are confident in how many lumens of light are needed, we can get to the fun part of finding light fixtures for our design!

These might be from Pinterest or from your favorite lighting website. Personally I love to start at Lumens.com, or reference my light fixture library, which are the fixtures I use over and over on my own projects.

Note: As an Amazon Associate I may earn a small commission from qualifying purchases if you choose to follow the links provided on this website. This of course doesn't result in any additional cost to you as a customer.

I hope this helps! Reach out if you have questions, and good luck with your project!

-Steve Duncan, AIA

Architect & Lighting Designer

FOREST VIBE | EXAMPLE LIVING ROOM LIGHTING LAYOUT

Forest Lighting Layout Living Room Template

LIGHTING VIBE

Dappled, natural, connected.

LIGHTING STRATEGY

This scheme requires a balance of accent light and uplight, to create pockets of bright and dark at the ceiling and floor. Pendants with a patterned shade can also be used to create an organic pattern of bright light and dark shadow.

ROOM FINISHES

Medium tones are recommended, and wood treated with a semi-opaque stain (avoid glossy finishes).

FOREST VIBE | PROJECT EXAMPLES

Forest Lighting Vibe_Palo Alto Medical Foundation_NBBJ

PALO ALTO MEDICAL FOUNDATION | SAN CARLOS

Architect: NBBJ | Lighting Designer: Jesse Prince & Steve Duncan

Forest Lighting Vibe_Amazon Spheres Plaza Tree Canopy Close_NBBJ

AMAZON SPHERES PLAZA | SEATTLE

Architect: NBBJ | Lighting Designer: Jesse Prince & Steve Duncan

Forest Lighting Vibe_Amazon Spheres Plaza Tree Canopy_NBBJ

AMAZON SPHERES PLAZA | SEATTLE

Architect: NBBJ | Lighting Designer: Jesse Prince & Steve Duncan

WHY I LOVE A FOREST LIGHTING VIBE

It was a once in a lifetime design opportunity...

I'd been tasked with designing a new home, nestled into the woods, on an island just outside Seattle.

The property was sublime. I felt like I was on a camping trip, detached from reality, in tune with nature. There were so many sources of inspiration, but it was only after we went on a hike in the woods nearby that it all clicked for me.

Mist was coming up off of the ground, and streaks of dappled light streamed through the canopy of the trees, and in that moment I knew we wanted to recreate that feeling with the architecture. There's a reason that people want to escape back to nature.

Architecture should be there to keep us safe and protected, while still reminding us that nature isn't "out there", it's IN HERE.

WHAT TO LOOK FOR IN A QUALITY LED LIGHT

Regardless of the vibe you are going for, there are two things that can trip up designers when they are selecting LED lighting:

COLOR RENDERING INDEX (CRI)

If you only remember one thing from me, please remember that color rendering is EVERYTHING when it comes to lighting. If you love incandescent and halogen lights, but hate fluorescent, then color rendering is the reason.

We always want to find lights that have a color rendering (CRI) of at least 90, so that we can bring out the true color of our room finishes and decor. Many LED lights have a color rendering of 80, and this score is actually worse than fluorescent (which has a score of 82). As you can see in the image below, the true color of the wood is brought out with the light on the right, which has a score of 90. The red tones of the wood come through and it feels warm. In contrast, the light on the left makes the wood look a bit greenish and yellow, because it has a poor color rendering score of 80.

Trust me! It's worth it to spend just a little bit more on lights to make sure that you're getting LEDs with a score of 90 or higher, so that the people and finishes in your spaces feel vibrant and full of life. Make sure to pay attention to this when you find a light you like and you're ready to hit that "order" button.

DIMMER COMPATIBILITY

Lastly, make sure that the LEDs you select are dimmable. This is something you need to check in the product cutsheet or through the web store that you are browsing.

Also, you'll need to make sure that the dimmer you select will be compatible with the LED light fixture. In the past, we could easily dim incandescent and halogen lighting with a simple rotary dimmer. This may or may not work for a new LED light fixture.

You wouldn't expect your television remote to be able to turn on your stereo system, would you? The same is true for LED dimmers. You have to make sure that the dimmer switch can actually communicate with the light fixture.

There's a variety of dimming protocols: it may be TRIAC, Electronic Low Voltage (ELV), 0-10 Volt, or DALI. So make sure to work with your electrician or a sales representative to make sure that the components of your lighting design are all compatible.

WHY IS IT IMPORTANT TO DO A LIGHTING CALCULATION?

If you want to be confident in your lighting design, you have to do a lighting calculation. It's as simple as that.

But how do we actually estimate how bright a room actually needs to be? Well, the footcandle targets for a room are set by the Illuminating Engineering Society of North America (IESNA), and the International Association of Lighting Designers (IALD). This professional organization has studied and analyzed the functional requirements for each kind of space designed by architects. For residential projects, I like to refer back to the National Renewable Energy Laboratory & Department of Energy's footcandle targets, since those are made freely available to the public. These are the targets I use for my own projects, and are the basis for the lighting estimator on this webpage.

You don't want to have too little light. It's expensive for a contractor and electrican to come back after the fact to revise the lighting strategy and patch the walls/ceiling. This happened to an interior designer early in my career, and it wasn't a fun situation. For me, it was the beginning of a great collaboration with this design professional, because we worked on many projects after that - but of course it would have been better if this interior designer hadn't made that mistake to begin with.

Likewise, you also don't want to be too bright, and overspend on lighting, just because you're unsure what is needed and just hoping for the best (yikes!).

This is fundamentally why I created the lighting estimator at the beginning of this webpage - to balance making sure there's enough light, while also making sure a client isn't paying for too many lights. Hopefully using the calculator was straightforward. Reach out with questions (before buying/building anything), if you'd like help! Good luck on your project!

-Steve Duncan, AIA

Architect & Lighting Designer

Steve Duncan Lighting Designer & Architect

WORKS CITED

Duncan, Steve. "Why Is It Important to Do a Lighting Calculation?" Lighting Design Insights. [LightingJUMP.com, https://www.lightingjump.com/how-many-lights-forest-vibe].

The author emphasizes the necessity of conducting lighting calculations to ensure effective lighting design in various spaces. He cites the Illuminating Engineering Society of North America (IESNA) and the International Association of Lighting Designers (IALD) for their established footcandle targets that help determine appropriate lighting levels. Duncan also mentions the National

Renewable Energy Laboratory (NREL) and the Department of Energy's publicly available footcandle targets, which he uses for residential projects. He shares a personal anecdote about the complications that arise from inadequate lighting, stressing the importance of precise calculations to avoid costly adjustments and excessive spending. The lighting estimator featured on his webpage is designed to assist clients in achieving optimal lighting without overspending.

REFERENCES

Duncan, Steve. "Why Is It Important to Do a Lighting Calculation?" Lighting Design Insights. .
National Renewable Energy Laboratory. “Light Emitting Diodes (LEDs) in Residential Lighting.” NREL/TP-53467. 2012. https://www.nrel.gov/docs/fy12osti/53467.pdf.
Illuminating Engineering Society. "Standards." https://store.ies.org/individual-standards/?v=0b3b97fa6688.
International Association of Lighting Designers. "About the IALD." https://iald.org/IALD/IALD/About/About-the-IALD.aspx?hkey=104e951f-5da0-4cb8-8ca8-8cce8a7b4caf.