I’m three days into the first week of hanging Christmas candle lights in my living room window, and I’ve already returned one set and re-did the whole thing twice. The first set looked great in the box photo: warm white, classic taper shape, 12 lights per string. The box said the bulbs were 1.5 inches tall. I didn’t measure. Big mistake.
The bulbs were closer to 3 inches, hung down from the cord like little clubs, and the clip that was supposed to hold them to the window frame snapped off on day three. Not the adhesive failing (that was day two), the plastic clip itself. So if you’re about to buy Christmas candle lights for windows, here’s what I wish someone had told me before I burned a weekend.
The one decision that actually matters: bulb size
I wasn’t prepared for how much the bulb size and shape change the look. I thought 'candle lights' was one thing. It isn’t.
I bought a set with 1.5-inch bulbs from a local store, then a second set with 2.5-inch bulbs from the same brand. The difference wasn’t subtle. The smaller bulbs looked like glowing decorations, not candles. The taller ones looked like real tapers, but they caught the wind from the window seal and swayed too much. Also, the taller ones blocked more of the view at night. If you have a small window, the ratio matters more than you think.
Sizing tip: hold a ruler up to your window frame and imagine the cord across the glass. A 12-light string with 2-inch bulbs takes up about 60 inches of horizontal space. My window is 34 inches wide, so I had to loop the cord. The loop looked messy, but it was better than four bulbs hanging outside the frame.
For a single window like mine, you might not need the full 12-light string. The 6-light string is usually 36 inches long. I ended up using that for the second window and it looked cleaner.
Cord length: the spec you’re probably ignoring
The box always lists the length of the cord. I ignored it. The first set had a 10-foot lead cord from the plug to the first bulb. The second had 3 feet. I have one outlet on the left side of the window, and the sets with the long lead cord let me reach the right side without an extension cord. The set I kept had the 10-foot lead.
That 10-foot lead also gave me the option to mount the transformer inside, on the sill, and string the cord out the bottom. The bulbs stayed on the glass. The transformer covered the plug, which wasn’t in the photo but worked.
Also check the spacing between bulbs. The first set had 6-inch spacing, which made each bulb stand out. The second had 4-inch spacing, which looked more like a solid line. On a single window, I actually preferred the 6-inch spacing. More separation sells the 'candle' look. For indoor use, spacing matters less, but if you’re putting them in a window to be seen from outside, the spacing changes the whole feel of the display.
What the photos never show: the clip problem
I can’t be the only one who’s wrestled with those plastic clips. The set I kept had adhesive-backed clips. Slapped the first one on the frame at 6 PM, with the window temp around 65°F. By morning, the first clip was on the floor. The adhesive said 'outdoor too,' but I doubt it holds much below 50°F.
There are clips that hook over the window frame edge instead of sticking to the glass. The hooks work better on wooden frames, but on vinyl frames they can slip off. On a dry, 50-degree day they held through a windstorm, but I wouldn’t trust them on a double-hung that rattles.
The best I found in my garage: small command hooks rated for 12 oz, placed just above the window sash. I ran the cord through the hook and let the bulbs hang free. It took 20 minutes to set up all four points. No adhesive failure after a week. The set’s own clips went into a drawer.
If you’re hanging these high in a second-story window, plan the install for a day that’s above freezing. The adhesive brands fail under 50°F in my experience.
If you want to save the $20 and skip it entirely
The whole first week made me question whether these were worth it. If your window is tiny, like under 24 inches wide, a string of candle lights will just look like a cramped row. A single electric taper candle, maybe.
Also, if you’re in an apartment and the window is practically sealed shut, consider how hard it’ll be to get the cord from the plug to the glass without pinching the cord in the seal. I measured my window seal gap at 5/16th of an inch. The cord was 1/8th. It fit, but the rubber seal pressed against the wires. Not the end of the world, but if that cord is frayed, I wouldn’t want it near the house fire hazard. That’s one more reason I ended up mounting with command hooks, keeping the cord off the seal entirely—placed them a few inches up from the bottom edge of the window.
Last thing: I tested the remote control that came with the set. It had 10 brightness levels and a timer. The timer reset every day. Set it twice. It’s been fine since, but the default timer is 6 hours on, 18 off. The remote also controls the mode, but I only used steady on. Never used the flicker mode. It’s the kind of feature that sounds good in the marketing but you’ll probably ignore too.
For me, the right set clicked after I measured the bulb spacing and the lead cord length. If you’re still in the shopping phase, check those numbers first. If you’re thinking about lighting a big window with a dozen candles, the taller bulbs might look better, but for a normal bedroom window, 2-inch seems right.
If your windows are tiny, or you’re not ready to deal with clip failure, save the money and stick to a regular string of small lights. These aren’t for everyone, and the marketing won’t tell you that. But for a straightforward, single-window update, the right set and a few command hooks will get you there without the headache I had.
Related reads: Solar Candle Lights: What Two Months on a Covered Porch Taught Me, Led Candles With Remote: Skip These Three Mistakes, The Copper Fairy Lights Mistake That Cost Me Two Re-Dos and More guides in Decor & Lighting.