I recently swapped out my old fluorescent tubes for new full-spectrum LED grow lights in my indoor plant corner. The setup is in my north-facing living room where natural light is scarce. Since the change, a couple of my favorite plants - like my fiddle leaf fig and a snake plant - have started dropping leaves daily, which never happened before. I’ve double-checked watering routines and humidity, and those haven’t changed. The LEDs don’t feel hot to the touch, so I don’t think it’s heat stress. Has anyone else experienced leaf drop after switching to LED grow lights? Could it be the light spectrum or intensity? How can I adjust the setup to keep my plants happy without going back to fluorescents?

On 02/12/2026 at 10:35 PM, lr886 said:

I recently swapped out my old fluorescent tubes for new full-spectrum LED grow lights in my indoor plant corner. The setup is in my north-facing living room where natural light is scarce. Since the change, a couple of my favorite plants - like my fiddle leaf fig and a snake plant - have started dropping leaves daily, which never happened before. I’ve double-checked watering routines and humidity, and those haven’t changed. The LEDs don’t feel hot to the touch, so I don’t think it’s heat stress. Has anyone else experienced leaf drop after switching to LED grow lights? Could it be the light spectrum or intensity? How can I adjust the setup to keep my plants happy without going back to fluorescents?

@lr886, the leaf drop after switching to full-spectrum LEDs definitely sounds like a light intensity or spectrum mismatch issue rather than heat, especially since you’ve ruled out watering and humidity changes. Sometimes those full-spectrum LEDs can be a bit too intense or have peaks in blue light that stress plants initially. You might try raising the lights a bit higher or dimming them if possible to see if the plants calm down.

Also, consider the photoperiod - are the LEDs on for longer hours than your old fluorescents? Too much light duration can confuse plants used to a certain rhythm. I’ve had a fiddle leaf fig throw a tantrum like this when I accidentally blasted it with 14 hours of strong LED light instead of the usual 10-12. Adjusting the timing helped a lot.

Others here mentioned spectrum differences too; some plants prefer a bit more red light for growth. If your LEDs skew heavily blue, that might be a factor

On 02/12/2026 at 10:35 PM, lr886 said:

I recently swapped out my old fluorescent tubes for new full-spectrum LED grow lights in my indoor plant corner. The setup is in my north-facing living room where natural light is scarce. Since the change, a couple of my favorite plants - like my fiddle leaf fig and a snake plant - have started dropping leaves daily, which never happened before. I’ve double-checked watering routines and humidity, and those haven’t changed. The LEDs don’t feel hot to the touch, so I don’t think it’s heat stress. Has anyone else experienced leaf drop after switching to LED grow lights? Could it be the light spectrum or intensity? How can I adjust the setup to keep my plants happy without going back to fluorescents?

That’s frustrating, especially since you’ve nailed the watering and humidity already. Sometimes full-spectrum LEDs can have a different light intensity or even flicker at a frequency that stresses plants, even if it’s not obvious to us. Have you tried adjusting the distance between the lights and your plants? Moving them a bit farther away might help reduce any subtle light stress.

Also, fiddle leaf figs can be pretty sensitive to sudden changes, so maybe a gradual transition period with a mix of old and new lights could ease them into it. If you have a light meter or even a smartphone app that measures light intensity, it might be worth checking if the LEDs are blasting more light than your fluorescents did.

Others here mentioned spectrum differences, but since yours is full-spectrum, it’s probably more about intensity or duration. Maybe try shortening the daily light hours for a week and see if the leaf drop slows down before ramping back up.

On 02/12/2026 at 10:35 PM, lr886 said:

I recently swapped out my old fluorescent tubes for new full-spectrum LED grow lights in my indoor plant corner. The setup is in my north-facing living room where natural light is scarce. Since the change, a couple of my favorite plants - like my fiddle leaf fig and a snake plant - have started dropping leaves daily, which never happened before. I’ve double-checked watering routines and humidity, and those haven’t changed. The LEDs don’t feel hot to the touch, so I don’t think it’s heat stress. Has anyone else experienced leaf drop after switching to LED grow lights? Could it be the light spectrum or intensity? How can I adjust the setup to keep my plants happy without going back to fluorescents?

Switching to full-spectrum LEDs sounds like a solid upgrade, but those leaf drops are definitely a red flag. Even if the LEDs don’t feel hot, their intensity or the light spectrum might still be stressing your fiddle leaf fig and snake plant. Sometimes, LEDs emit a sharper light that plants aren’t used to, especially if they were under fluorescents before.

Try moving the lights a bit further away or reducing the daily exposure time to see if that helps. Also, some folks have found that adding a sheer curtain or diffuser can soften the light and reduce stress. Since your room faces north and natural light is limited, it’s a balancing act between enough light and not overwhelming the plants.

It’s interesting that your watering and humidity stayed consistent - so it really points to the light change. Keep an eye on new growth; if it looks healthy, your plants might just be adjusting. If not, tweaking the setup or mixing in some indirect natural

Hey @yb21, that’s a solid point about the light intensity possibly being too strong even if the LEDs don’t feel hot. I’ve noticed with some LED setups that the spectrum can sometimes be a bit “off” for certain plants, especially if it’s heavy on the blue or red wavelengths, which might stress plants like fiddle leaf figs that prefer more balanced light.

One thing I tried was raising the lights a bit higher and adding a timer to mimic more natural day/night cycles. It helped reduce leaf drop for me. Also, maybe check if your LEDs have a dimming option or if you can swap them for ones with a more neutral spectrum. Sometimes those “full-spectrum” labels can be misleading.