In last week's column, I introduced "LED grow bulbs." Since I wanted even those who’ve never tried them before to give them a go, I shared some for sale. So of course, there are folks trying these out for the first time! That’s why, this week, I’ll keep things simple and explain how to use them, especially for beginners. Think of this as your user manual.
If you’d like to dive into details about their specs or my test results, please check out my previous column.
For this article, I prepared a bulb-shaped LED light like the one shown here. Of course, there are many types besides the bulb shape, but today we’ll focus just on this kind.
An LED grow bulb is, as the name suggests, a "bulb," so you’ll need a compatible light fixture to use it. These bulbs generally work with fixtures labeled as E26 or E27 socket size; however, grow bulbs tend to be much bigger than regular bulbs (sometimes 5 or 10 times brighter!), so you’ll need to choose your fixture carefully.
The easiest setup is to use a socket with a cord, plus a stand to hang it from.
My personal favorite is the Joseph Iron Hook Stand. It’s the perfect size, stylish, and affordable. I bought mine from Monotaro. My only nitpick is that the hook position is fixed, so if you have a plant wider than 12cm, you’ll need to get creative to shine the light right in the center. They also carry a lot of professional display stands, so check those out too.
As for the socket, the cheapest kind works just fine. For this article I used an ELPA cord socket from Monotaro. The little rotary switch is adorably retro.
If you already have a standing lamp, it’s easy to set up, and looks great too. Many lamps with shades have openings too small for grow bulbs, so opt for models with just a socket (for use as a bare bulb) or one with a nice big shade, making sure it says E26 socket. Since a 20W LED doesn’t get very hot, any fixture that can handle a 40–60W incandescent should be fine.
■ francfranc "Narrow Lamp" 9500 yen
A stylish stand light that creates a high-end, hotel-like vibe.
■ IKEA "Harslinga" 2999 yen
Modern design meets flexible height and angle options—plus, that IKEA pricing is hard to resist.
■ BARREL "Acon" 7710 yen
Designed specifically for LED grow bulbs, this stand is functional yet simple.
On social media, it’s common to see people setting up slide rails above dedicated plant shelves and hanging lots of LED grow bulbs from them. While you could order these from an electronics store or Amazon, DAISO offers them conveniently and affordably.
It takes a bit of effort to install, though—if I do it at home, I’ll share a detailed walkthrough next time.
Many succulents are known to photosynthesize at night, so don’t leave your LED grow lights on 24/7—instead, turn them off at night to give your plants their rest time. Of course, you can operate them manually, the same as your room lights—switch them off at bedtime and on when you wake up. But a timer outlet that automatically handles ON/OFF is super handy.
■ Revex Digital Program Timer 1,260 yen
Just plug it in! It says up to 1500W, but the manual advises "up to 250W for LED bulbs"—so for 20W bulbs you can use around 12 at once. The digital version can be switched ON/OFF even without unplugging, which is a subtle but nice perk.
There’s also an analog version, which I used to like, but I found that the clocks drift and aren’t reliable long term—so I’ve switched everything over to digital. I highly recommend going digital.
■ Meross Smart Plug 1,500 yen
If you’re savvy with Wi-Fi and smartphones, consider a smart plug! From experience, aside from turning the outlet on/off with your phone (which is mostly for timer-based ON/OFF anyway, so you rarely need to do it by hand), I’m not sure there’s much extra benefit. Sometimes the ON/OFF fails if your internet is acting up, too.
The manual doesn’t specify, but it’s probably best to stick to 12 bulbs at 20W each, max.
This isn’t just about the LED bulbs—if you’re keeping plants indoors, a fan is honestly essential. That said, you don’t need anything fancy; in a typical living space, one fan meant for an 8-tatami-mat room is enough. Run it 24/7.
Once you have all your gear, it’s time to put everything together! This is the "hands-on" section, including how to care for your plants.
Even before setting up, let’s talk about how long to keep your lights on each day.
Remember: don’t leave your LED lights on 24/7; turn them off at night to give your plants a rest. Many believe succulents photosynthesize at night, so if you skip "nighttime," they won’t thrive (though I haven’t tested this myself, so I can’t swear it’s 100% true).
Most people leave the lights on for 12 to 15 hours a day, but there’s not really a single "correct" answer. There’s also debate about whether you should keep them on longer in summer and shorter in winter—again, there’s no single answer. Experiment and find what works for you!
#In large-scale plant factories, some reports suggest alternating red and blue lights 24 hours a day yields faster growth than a strict 12-hour cycle. There’s still lots of room for trial and error!
Direct sunlight is said to be around 100,000 lux. In my own experience, succulents thrive in 150,000–300,000 lux. Depending on the specs of your LED bulb, this usually works out to about 20–30cm away.
But honestly, who measures in lux at home? Are you expected to buy a light meter?! Don’t worry. There’s just one real rule for adjusting the lighting distance:
Keep it just far enough to avoid leaf burn.
To avoid frying your plants, start at 30–40cm away, watch them for 2–3 days, and move the light a little closer if they’re doing fine—keep repeating this process.
Don’t stress. Plants are super adaptable. The range between "burnt" and "unhappy-stretchy" is pretty wide, so trust your gut.
Run your circulator fan all day, every day. Plants need airflow to breathe! If it gets stuffy and still at night when nobody is around, plants can quickly start to suffer.
You might see lots of people blasting their plants with tons of fans on social media (thinking stronger wind makes for faster growth), but actually, one fan per room running indirectly—not aimed straight at the plants, and set to "low"—is more than enough. This won’t harm the plants’ health at all.
Start with just one fan, and add more only if you feel it’s necessary.
Watering habits should be totally different from traditional succulent care. If your air circulation is good, pots can dry out in less than a day even after full watering! This means water can run low fast, so place trays under your pots and fill them with water until they’re overflowing. It’s fine to refill the trays every day so they’re always topped up.
Wait, don’t succulents like it dry? Aren’t you supposed to water only after the soil dries out? Won’t they rot? It’s time to leave those old assumptions behind.
The very first change you’ll notice after starting LED management is that the leaves pull in, closing up tightly. This is a defensive reaction to stronger light—actually, it’s proof your LED bulb is working! If the leaves are splayed out and floppy, that’s a warning sign your light might be too weak.
You might also see the oldest outer leaves dry up and die—this means the plant is shedding old leaves to make new ones, which is actually a great sign.
Once your plant's rosette has closed up, water thoroughly and watch closely. In as little as a week, you’ll see new leaves emerging from the center and the rosette will start opening up again. You should see sturdy, slightly rosy new leaves—these are robust, nutrient-packed leaves that can handle strong light. Your goal: a healthy, beautiful, cool-looking plant absolutely full of these new leaves!
#Plants like slow-growing agaves or cacti that don’t change shape readily won’t exhibit such dramatic transformations. Before trying these "silent types," it’s a good idea to practice with easy-to-read echeverias first.
On the flip side, too much light can cause leaf burn. Signs may show up as soon as 1–2 days, so after setup or changing distances, check your plants daily for about three days.
Because strong LED light makes it hard to see true colors, it’s best to turn your LED off and inspect your plants in normal room light or daylight.
Leaf burn is when the surface of a leaf dries and collapses irreversibly. If the surface is still smooth and it’s just a little discolored, that’s "sunburn"—and actually, that’s what you want. If you’re worried you’ve gone too far (since sunburn is just a step before leaf burn), back off the light and see if things recover. If they do, you can try moving the light a bit closer again.
And finally, the topic no one likes…
Just because your plants are indoors doesn’t mean they’re safe from pests. Often, bugs hitch a ride in the soil. Fungus gnats and beetles can sometimes sneak inside and multiply, too.
At my place, whenever I spot beetles, I deal with them using Benika X Fine Spray. Besides that, it’s a good idea to proactively soak and disinfect your plants, or mix pests-preventing agents into your soil before bringing them inside.
So there you have it—a summary of tips for managing succulents with LED grow lights. I hope this helps anyone thinking, "I’m about to try using LEDs for the first time!"
By the way, I feel like this article could use a few more photos, so I’ll be updating this as I get the chance. There are so many fun projects going on that it’s hard to keep up, but I hope to share even more exciting content with you all soon!
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