Choosing fairy lights starts with matching the product’s rating and location to how you’ll use them, not just how they look.
Fairy lights get bought on looks more than almost any other product, and that’s exactly where the trouble starts. The right way to choose fairy lights hinges on one thing: where they’ll live and what they’ll do. A set that’s perfect for a bookshelf can be a genuine fire risk draped across a porch railing. The good news is that in the U.S., the safety information you need is printed right on the package—you just have to know what to look for.
Before you compare bulb counts, settle the basics: indoor or outdoor, decorative or task lighting, cord length, power source, and whether you want dimming or smart controls. That short list filters out most of the market before you ever look at a price tag.
Start With Indoor vs. Outdoor—It’s a Safety Question, Not a Suggestion
This is the first and most important filter. In the United States, decorative lighting strings are evaluated under UL/ANSI 588, and the label tells you exactly where the product is allowed to go.
That label is the whole ballgame for U.S. buyers. Buying indoor-only lights for outdoor use is the single most common mistake, and it’s not a minor one.
Decode the Ratings: IP44, UL Mark, and “All-Year Use”
Once you’ve sorted indoor from outdoor, the next layer is understanding what the ratings actually mean—and what they don’t.
The UL Listing Mark means representative samples of that product were evaluated for fire, electric shock, and other hazards. It is not a blanket approval for every use scenario, and it’s not the same as the green/red label. For string lights meant to stay up all year, UL’s guidance points to UL 588 Supplement SD, and in some cases UL 153 applies when the cord size is 18 AWG or larger.
Here’s where marketing gets slippery: “all-year use” does not automatically mean “outdoor use.” UL’s supplement is about the product’s scope and construction, not a universal outdoor claim. Similarly, an IP44 rating means the product is protected against water splashes from any direction—it does not mean the lights are waterproof or safe to submerge. Treat IP44 as “okay for rain and splashes,” not “okay to sit in a puddle all winter.”
Pick the Right Power Source and Features for the Location
Power source comes down to the same location logic. Outlets are great for porch lights and permanent installs, but cord length becomes a constraint. Battery-operated sets—typically AA or USB—are the right call for shelves, wreaths, and anywhere a cord would be an eyesore or a trip hazard. If you’re shopping for battery-powered lights with a remote, our tested battery-operated fairy light roundup compares the options that actually hold up.
Features matter less than placement, but a few are worth prioritizing:
- Dimming—valuable for bedroom and nursery use, where full brightness is rarely wanted.
- Timers—a genuine battery saver and one of the most useful features on any set.
- Smart controls—Wi-Fi or Bluetooth sets like those in the WiZ line are controlled through an app and often need no separate hub, but they cost more and add setup steps.
For a sense of what’s actually available at a given price, here’s a snapshot of three current products to calibrate your expectations:
| Product | Specs | Notes |
|---|---|---|
| WiZ Smart Fairy Lights, 20m | IP44, 15W, 5000K, dimmable, Class 2 | Smart control via app; fixed drop style |
| WiZ Smart Fairy Lights (Multicolour) | IP44, 15W, 2700–5000K, 16M colors | Indoor and outdoor; no hub required |
| BrizLabs Smart Fairy String Lights | IP44, 66ft lighted length, 0.33ft spacing | Amazon listing; claims Alexa & Google compat |
That last column matters. The same skepticism should apply to any spec that sounds too good for the price.
FAQs
What does the green vs. red holographic label on string lights mean?
In the U.S., UL Solutions uses the holographic label to show where a decorative lighting string is rated for use. A green holographic label means the product is rated for indoor use only. A red holographic label means it has been evaluated for both indoor and outdoor use. Check for this label before you buy, and never assume a set is outdoor-rated because it looks sturdy.
Is an IP44 rating the same as being waterproof?
No. IP44 means the product is protected against splashing water from any direction—fine for rain and general outdoor exposure. It does not mean the lights are waterproof or safe to submerge. For lights that will face heavy weather or direct water spray, look for a higher IP rating and always follow the manufacturer’s instructions.
Are smart fairy lights worth the extra cost?
Smart fairy lights earn their premium when you actually use the smart features: scheduling, color changes, or adjusting brightness from your phone. If you just want lights that turn on and off, a standard set with a timer will do the same job for less money and fewer setup steps. Buy smart only if the app controls are features you’ll genuinely use.
Can I leave fairy lights up all year?
Leaving lights up and running them all year are two different questions. UL’s Supplement SD covers all-year-use string lights, but that scope is about the product’s construction, not a universal outdoor claim. Check the product’s specific rating for all-year use and match it to your location. In practice, verify the UL Listing Mark and the correct indoor/outdoor label before trusting any set for long-term installation.
Reference & Sources
- UL Solutions. “String Lights Year-Round Compliance Testing Services.” Covers UL 588 and UL 153 standards for decorative lighting strings.
- Health Canada. “Safety Assessment of Decorative Lighting Strings.” Documents strain-relief hazards that can expose live parts.
