Most outdoor lighting advice comes in one of two flavors: a shopping list, or a lecture. Neither helps much when you are standing in the yard at dusk wondering why the step by the back door is so hard to see, or whether the cord running across the patio is a problem. What I would like to write instead is the plain, slightly nerdy middle: what each part of an outdoor lighting setup is for, what the labels and ratings mean, what the research says, and what you can safely do yourself.
This is the hub of a nine-part series called Outdoor Lighting, One Topic at a Time. It goes one subject at a time, from the labels on the box to security lights, and every post is meant to stand on its own. Every claim that matters is attributed to a named source that I actually opened and read, and anything that is only my own suggestion is labeled as mine.
Image: A curved brick garden path at night, lit by low landscape lights by Asaph441, CC BY-SA 4.0, via Wikimedia Commons.
What good outdoor lighting is trying to do
DarkSky International, a nonprofit that works to reduce light pollution, publishes a short set of ideas called the Five Principles for Responsible Outdoor Lighting, written jointly with the Illuminating Engineering Society. The page sums them up in one line: “Light where you need it, when you need it, in the amount needed, and no more.” The five principles say responsible outdoor light is:
- Useful: it has a clear purpose.
- Targeted: it is directed so it falls only where needed, with shielding and careful aiming.
- Low level: no brighter than necessary.
- Controlled: used only when needed, with timers or motion detectors.
- Warm-colored: warmer colors where possible.
I like these because they are easy to remember and they apply equally to a porch light and to a whole garden. The series keeps coming back to them. They are DarkSky’s guidelines and not laws, and where I add a view of my own, I will say so.
Safety comes first
Outdoor lighting is an electrical product that lives in the rain. That is why the series starts with the plain, unglamorous things: what the label on a fixture promises (the labels post) and what a GFCI does (the GFCI post). The Electrical Safety Foundation International (ESFI) calls a GFCI “a lifesaver, not a luxury” outdoors, in a booklet that is older but still clearly written. I will say again what I say in every post: I am not an electrician. Anything hard-wired, any new outlet, and anything you are unsure of is a job for a licensed electrician.
Image: An exterior wall lantern on an iron bracket in Santarcangelo di Romagna by Terragio67, CC BY-SA 4.0, via Wikimedia Commons.
The photo above is an old iron wall lantern in an Italian town, there to remind us that outdoor lighting is nothing new. What is new is how many of us have a dozen lights around the house, and how rarely anyone asks whether each one is doing a job.
The nine posts
The nine posts roughly follow the order you would think about it: make it safe, make it right, make it pretty, and then deal with the special cases. This post is the hub, and the other eight are:
- Reading Outdoor Light Labels: what “suitable for damp” and “suitable for wet” mean, and how to read an IP rating.
- GFCI Outlets and Outdoor Lights: what a GFCI does, how to test one, and what it cannot do.
- Brightness and color: lumens, kelvins, warm light and the night sky.
- Path and step lighting: seeing where you step, without the glare, plus low-voltage basics.
- Landscape lighting techniques: uplighting, grazing, silhouettes and why less is more.
- Solar lights: what they do well and where they struggle.
- String lights and extension cords: hanging them safely, and where the advice differs.
- Security lights and motion sensors: what a New York experiment and a dark-sky group each say.
Three ideas that run through the series
Water and electricity need respect. the labels post, the GFCI post and the string lights post are about this: ratings that say a product can handle weather, GFCI protection that cuts power when current leaks, and cords and connections that stay dry.
More light is not the goal. DarkSky’s assessment page suggests pathways need 300 lumens or less and says to keep a home’s total output below 1,000 lumens. Landscape-lighting guides from Iowa State and Colorado State universities say something similar in their own words, about using light sparingly. My own suggestion is to start dimmer than you think you need.
Sources can disagree, and I will say so. For example, one DarkSky page recommends a color temperature of 3000K or lower, while another recommends 2700K or lower. A fire marshal’s tips allow insulated staples for string lights, while a manufacturer’s manual says no staples at all. When sources disagree, I would rather show you both than pretend they agree.
A one-evening walk-through
If you want a way to use the series, here is a simple one. At dusk, with the lights on, walk around your own property:
- Find the places someone could trip, such as steps, a curve, or a change of level. The paths post is for these.
- Look for glare: any bulb you can see directly from where you walk or sit. The brightness and color post and the paths post cover shielding.
- Look at the outdoor outlets. Do they have Test and Reset buttons? The GFCI post shows how to check.
- Look at the cords. Are they outdoor-rated, and are connections off the ground? The string lights post is about this.
- Look at the sky. Is any light shining upward, or into a neighbor’s window? The brightness and color post and the security lights post cover that.
Ground rules for this series
A few promises I am holding myself to. I name the source for each factual claim, and where only one source says something, I say so. I use Wikipedia for general background and primary or institutional sources, such as universities, state agencies, DarkSky International and research papers, for the facts that matter. Where a document is old, I give its date. Some guidance, such as electrical code details, changes over time and by place, so check the current local rules. I do not recommend brands, and there are no prices. Every photo in the series is a real photograph from Wikimedia Commons under a free license, with the credit shown right under it.
It is not a wiring manual, and it will not tell you how to install a hard-wired fixture or a new outlet. It is not a product review either: you will not find prices, shopping links or brand picks. And it does not cover indoor lamps. The goal is understanding, so that when you do read a package, talk to an electrician or choose between two fixtures, you know which questions to ask. Think of it as a friend who has read the manuals and the studies and is telling you what stood out.
Where to start
If you are new to this, read the posts in order. If you have one problem, jump to the post about it: a sticky GFCI, a glare-heavy porch, or a string of lights you want to hang for the weekend. Each post ends with a short source list and links to its neighbors.
Sources
- DarkSky International: Five Principles for Responsible Outdoor Lighting
- DarkSky International: Home Outdoor Lighting Assessment and Responsible home outdoor lighting
- Electrical Safety Foundation International: Outdoor Electrical Safety Check booklet
- Iowa State University Extension: Landscaping with Light (1994)
- Colorado State University Extension: PlantTalk: Landscape Lighting
- Texas Department of Insurance, State Fire Marshal’s Office: Decorating Safely with Outdoor Lights