Introducing Block Patterns
Designing the best lighting for your home in Atherton, California, requires careful attention to local zoning regulations, homeowner association rules, and energy efficiency standards.
Introduction – Atherton California Lighting Design Requirements
This guide covers everything from the best residential lights of 2025 to essential factors like Color Rendering Index (CRI) and dimmer compatibility.
Whether you’re upgrading your interior or landscape lighting, we’ll help you navigate the key requirements and choose the right solutions for your Atherton home.
Table of Contents
- Lighting Design Requirements for Atherton California
- Zoning & Planning Requirements
- Home Owner Associations & Deed Restrictions
- Best Residential Lights of 2025
- How Many Lights Will I Need?
- What to Look For In a Quality Light
- Color Rendering Index
- Dimmer Compatibility
- Energy Efficiency Requirements
- Works Cited
Residential Lighting Design Requirements for Atherton California
Atherton Zoning & Planning Requirements for Lighting
17.40.040 General Development Standards I. – Lighting at Accessory Buildings in Atherton
Any lighting on accessory buildings or structures outside the main building area must be shielded or directed downward, so it doesn’t spill onto neighboring properties.
17.40.050 Development Standards for Specific Types of Accessory Buildings & Structures in Atherton
No artificial lighting is allowed to be installed to illuminate an athletic court, and lighting from other areas on the property, like landscape or porch lights, can’t be used for this purpose either.
17.50.080 Plant Coverange and Tree Sizes – Hillside Lots – Screening Lighting for Atherton
Landscape screening plans must be designed to block any lighting from buildings or structures, ensuring that light doesn’t spill over onto nearby properties.
17.53.060 Objective Building and Design Requirements for Dwelling Units in Atherton
Exterior lighting should be directed downward and shielded, ensuring it doesn’t spill over onto nearby properties. Lighting that shines upward on trees or any permanent lighting installed in trees is not allowed.
Home Owner Associations, Deed Restrictions, Covenants and Easements
After reviewing any planning/zoning requirements required by the city, it is important to also check whether your property is subject to any Homeowners Association (HOA) rules, deed restrictions, easements, or covenants which could impose additional requirements on exterior lighting.
Some communities have specific guidelines about the types of fixtures allowed, such as prohibiting motion detector lights or requiring specific energy-efficient bulbs. Others may have restrictions for light brightness or the direction of light, aiming to reduce light pollution or preserve the character of the neighborhood.
Be sure to review these documents carefully to ensure compliance and avoid potential conflicts with your HOA or neighbors.
Best Residential Lights of 2025: Atherton, California
If you’d like help getting started, feel free to start with the lighting library I use for my own projects. I have listed these out in the images below, and I have vetted each of these lights for quality. Each light is UL Listed, has a customer rating of at least 4 out of 5 stars, and a color rendering index (CRI) of 90+.
– Steve Duncan, AIA | Architect & Lighting Designer
How Many Lights Will I Need?
To figure out how much illumination is needed for each room in our design, we can do a quick calculation. It only takes a couple minutes. First follow the link to our lighting estimators here. It’s easy and straightforward. You’ll need to know the dimensions of the room, what kind of room is being designed (kitchen, dining, etc.), and also what kind of vibe you want for your design (relaxed, bright, cinematic, and so on).
If you’d like to see a demonstration of how the estimators work, you can watch the video below:
You may be wondering how we know if a space will be bright enough. 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 estimators on this website.
You don’t want to have too little light. It’s expensive for a contractor and electrician 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 of what is needed and hoping for the best (yikes!).
This is fundamentally why I created lighting estimators – 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
What to Look for in a Quality LED Light for Your Atherton Lighting Design
Regardless of the vibe you are going for, there are three things that can trip up designers when they are selecting LED lighting for projects in Atherton.
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
If you want maximum functionality, make sure that the LEDs you select are dimmable. This is something you need to check in the product cut sheet 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.
ENERGY EFFICIENCY & ENERGY CODE COMPLIANCE
In California, residential lighting projects are subject to the energy efficiency requirements of the Title 24, specifically Joint Appendix Section 8 (JA8). You may have seen some light fixtures marketed as JA8 compliant, which means they deliver a minimum of 45 lumens of light, for every watt of energy used. These lights are referred to as being high efficacy. It’s a good idea to review the energy code adopted by Atherton, as published by the California Energy Commission. Another option is to reach out to your electrician for guidance, or use the Energy Code Hotline, before finalizing your lighting design.
Works Cited
Duncan, Steve. Why Is It Important to Do a Lighting Calculation? Lighting Design Insights. LightingJUMP.com. Accessed 9 Nov. 2024.
California Energy Commission. 2019 Building Energy Efficiency Standards for Residential and Nonresidential Buildings. California Energy Commission, 2019.
https://www.energy.ca.gov/programs-and-topics/programs/building-energy-efficiency-standards. Accessed 9 Nov. 2024.
Town of Atherton, California. Zoning Ordinance, Section 17.40.040: General Development Standards I. Atherton Municipal Code. https://www.ci.atherton.ca.us/DocumentCenter/View/193/Chapter-17-Zoning. Accessed 9 Nov. 2024.
Town of Atherton, California. Zoning Ordinance, Section 17.40.050: Development Standards for Specific Types of Accessory Buildings & Structures. Atherton Municipal Code. https://www.ci.atherton.ca.us/DocumentCenter/View/193/Chapter-17-Zoning. Accessed 9 Nov. 2024.
Town of Atherton, California. Zoning Ordinance, Section 17.50.080: Plant Coverage and Tree Sizes – Hillside Lots – Screening Lighting. Atherton Municipal Code. https://www.ci.atherton.ca.us/DocumentCenter/View/193/Chapter-17-Zoning. Accessed 9 Nov. 2024.
Town of Atherton, California. Zoning Ordinance, Section 17.53.060: Objective Building and Design Requirements for Dwelling Units. Atherton Municipal Code. https://www.ci.atherton.ca.us/DocumentCenter/View/193/Chapter-17-Zoning. Accessed 9 Nov. 2024.
National Renewable Energy Laboratory. Light Emitting Diodes (LEDs) in Residential Lighting. NREL/TP-53467, 2012. https://www.nrel.gov/docs/fy12osti/53467.pdf. Accessed 9 Nov. 2024.
Illuminating Engineering Society. Standards. Illuminating Engineering Society, 2024. https://store.ies.org/individual-standards/?v=0b3b97fa6688. Accessed 9 Nov. 2024.
International Association of Lighting Designers. About the IALD. International Association of Lighting Designers, 2024. https://iald.org/IALD/IALD/About/About-the-IALD.aspx?hkey=104e951f-5da0-4cb8-8ca8-8cce8a7b4caf. Accessed 9 Nov. 2024.
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