The circadian light bulb
Most light bulbs keep your brain awake long after your body wants to rest. LISNA shifts from energising daylight to deep, blue-free amber as evening falls — so sleep comes naturally.
€24.95
Free shipping · E27 · 7W · Ships within 2 days
Hover to try the modes
1700K
Evening · Low blue light
Three modes — one switch
No app. No hub. No setup. Just turn your light off and back on within 5 seconds to cycle between modes.
DAYLIGHT
4000K · Full spectrum
Clear, energising light for mornings and focused work. Keeps you sharp and alert throughout the day.
AMBER
1700K · Low blue light
Warm amber glow for evenings. Signals your body that sleep is approaching. Switch on after sunset.
EMBER
1000K · Zero blue light
Deep red warmth for the hour before bed. No blue light whatsoever. Your melatonin will thank you.
Backed by science
Circadian lighting is one of the most well-supported interventions in sleep science.
2×
Blue light suppresses melatonin twice as effectively as warm light, delaying sleep onset significantly.
Harvard Medical School
248
Scientists reached consensus that circadian lighting should be introduced widely in homes and workplaces.
Frontiers in Photonics, 2023
98
CRI rating — colours appear as natural as sunlight. Most standard bulbs score 80 or below.
EVERFINE certified test data
<0.5%
Of all lighting sold today adjusts its blue light content between day and night. LISNA does.
Lighting market analysis
How to use LISNA
No instructions needed. But here's the full picture.
Screw it in
Fits any standard E27 socket — bedside lamp, floor lamp, ceiling fixture.
Start in Daylight
Default mode on first switch. Clear and energising for mornings and focus.
Switch to Amber
After sunset, turn off and on within 5 seconds. Warm, sleep-ready glow.
Switch to Ember
One more cycle before bed. Deep red warmth. Zero blue light. Sleep deeply.
Order
LISNA Circadian Bulb
The only bulb that shifts with your body clock. Three modes, one switch, no app. Just better sleep.
€24.95
incl. VAT · free shipping
Questions
Does it work with my existing light switch?
Yes — LISNA fits any standard E27 socket and works with your existing wall switch. No smart home hub, no app, no special wiring needed.
Will it remember which mode I was using?
Yes. If you leave the light off for more than 8 seconds, it remembers your last mode when you switch it back on. Only a quick off-on within 5 seconds cycles to the next mode.
How quickly will I notice a difference in my sleep?
Most people notice they feel more ready for sleep within the first few evenings. Melatonin responds to light changes quickly — often within 30–60 minutes of switching to Amber or Ember mode.
Is it really different from a regular warm bulb?
Yes. Standard warm white LEDs at 2700K still emit significant blue light. The LISNA Amber (1700K) and Ember (1000K) modes are specifically engineered to minimise output in the wavelengths that suppress melatonin.
What is your return policy?
We offer a 14-day return period in line with EU consumer law. Return the product unused and in its original packaging within 14 days of receipt for a full refund.
Does it work with a dimmer switch?
LISNA is not compatible with dimmer switches — it requires a standard on/off switch to cycle between modes correctly.