Headaches & Migraines | Calm Green 520nm E14 Candle Light Bulb
£19.95
Blue and red light have both been shown to worsen migraine. Narrowband green light at 520nm is the only wavelength studied that reduces it.
Our CALM Green E14 Candle Bulb emits a precise narrowband 520nm green light with just 1.5% blue content – the wavelength University of Arizona research identified as the most tolerable for migraine and headache sufferers.
CALM Green Light Bulb is used by:
- People with migraines (chronic and episodic)
- Headache sufferers (tension, cluster)
- People with photophobia and light sensitivity
- Office workers whose lighting triggers head pain
CALM Green Light Bulb Key features:
- Narrowband 520nm green light
- Non-dimmable 3W, softer glow for evening and recovery use
- Flicker-free, low EMF
- E14 small screw candle fitting (UK / EU)
- Ultra-low 1.5% blue light
- Also available as E14 round bulb, E27 large screw, B22 bayonet
- CE, RoHS – 2 Year Warranty
Bought Together
Blue and red light have both been shown to worsen migraine. Narrowband green light at 520nm is the only wavelength studied that reduces it.
Our CALM Green E14 Candle Bulb emits a precise narrowband 520nm green light with just 1.5% blue content – the wavelength University of Arizona research identified as the most tolerable for migraine and headache sufferers.
CALM Green Light Bulb is used by:
- People with migraines (chronic and episodic)
- Headache sufferers (tension, cluster)
- People with photophobia and light sensitivity
- Office workers whose lighting triggers head pain
CALM Green Light Bulb Key features:
- Narrowband 520nm green light
- Non-dimmable 3W, softer glow for evening and recovery use
- Flicker-free, low EMF
- E14 small screw candle fitting (UK / EU)
- Ultra-low 1.5% blue light
- Also available as E14 round bulb, E27 large screw, B22 bayonet
- CE, RoHS – 2 Year Warranty
Blue and red light have both been shown to worsen migraine. Narrowband green light at 520nm is the only wavelength studied that reduces it.
Our CALM Green Lamp emits a precise narrowband 520nm green light with just 2.5% blue content – the wavelength University of Arizona research identified as the most tolerable for migraine and headache sufferers. Select “play icon” displayed on image for lamp in use.
CALM Green Light Lamp is used by:
- People with migraines (chronic and episodic)
- Headache sufferers (tension, cluster)
- People with photophobia and light sensitivity
- Office workers whose lighting triggers head pain
CALM Green Light Lamp Key features:
- Narrowband 520nm green light
- 3 brightness settings 25%, 50%, 100%
- Rechargeable Up to 18 hours runtime, USB Type-C
- 360° flexible gooseneck light exactly where needed
- Flicker-free, no glass, folds palm-size and travel-friendly
- Ultra-low blue light 2.5%
- Certified CE, RoHS, FCC – 2 Years Warranty
- Also available in Black
Standard household lighting contains approximately 25-35% blue light, which signals daytime to the brain and impacts sleep. Our SLEEP Red E14 Candle Light Bulb is 100% blue light free.
Perfect for bedside lamps, chandeliers, wall sconces, and the hours before sleep – providing a Peaceful Red glow 100% flicker free. Press “play” icon displayed on image for before and after.
SLEEP Red Candle Light Bulb is used by:
- Children and adults who struggle to sleep
- Adults & Children prescribed melatonin
- Children and adults with autism or ADHD
SLEEP Red Candle Light Bulb Key features:
Description
The CALM Green 520nm Candle Light Bulb (E14)
The Calm Green 520nm Bulb E14 candle fitting is most commonly found in chandeliers, decorative wall sconces, and smaller table lamps.
This bulb screws into those fittings and emits a precise narrowband 520nm green light – the exact wavelength used in the Arizona and Harvard research.
Blue light content is just 1.5% – far below standard household lighting (25-35%) and office lighting (around 45%), both of which are common migraine triggers.
At 3W and 180 lumens, it produces a softer glow than the E14 round bulb – particularly suited to ambient and recovery lighting, where lower intensity is preferred during a migraine attack or for evening use in light-sensitive households.
The Clinical Findings of LED Green 520nm Lighting
In a 10-week clinical study, participants used narrowband 520nm Green Light exposure as part of their migraine management. Across the group:
- Headache days per month reduced by approximately 60% on average
- 86% of episodic migraine sufferers reported over 50% reduction in headache days
- 63% of chronic migraine sufferers reported over 50% reduction in headache days
- Participants also reported reduced photophobia, improved sleep, and reduced anxiety
(Lipton, Burstein et al., Frontiers in Neurology, 2023 — full reference below.)
Many of our customers tell us they’ve been able to switch off harsher overhead lighting altogether and use the CALM Green lighting as their primary light source during the afternoon, evening, headache episodes, and recovery.
Where to use the CALM Green E14 Candle Light Bulb
- Chandeliers in bedrooms, dining rooms, and quiet rooms
- Wall sconces in hallways, bedrooms, and migraine recovery spaces
- Decorative table lamps for evening use when overhead lighting feels too bright
- Children’s bedrooms with chandelier-style fittings, where frequent headaches or sensory aversion to bright lighting are an issue
- Small accent lighting in sensory-friendly spaces
This bulb fits any standard E14 small screw candle fitting (UK and EU standard). For a brighter round E14 bulb suited to bedside lamps, see the CALM Green E14 round version. For larger Edison screw fittings, see the CALM Green E27 version. For bayonet fittings, see the CALM Green B22 version.
Q. Are all green light bulbs the same?
A. No. Most “green” bulbs on the market are tinted, coated, or colour-mixed, which means they still contain blue and other wavelengths that can make migraines worse. Our CALM Green is true narrowband 520nm – the precise wavelength used in the migraine research – with the lowest possible blue content and zero flicker.
Why Green Light 520nm Narrowband, and not Amber or Red, for Migraine and Headache Sufferers
If you suffer from migraines or chronic headaches, you’ve probably already realised that most lighting makes things worse. What’s less well known is that the colour of the light matters.
Migraine researchers including Dr Mohab Ibrahim (University of Arizona) and Professor Rami Burstein (Harvard Medical School) identified a specific neurological pathway – the retino-thalamo-cortical pathway – that connects vision directly to the brain circuits that produce migraine pain.
Through this pathway, narrow bands of blue light and narrow bands of red light both activate the photoreceptor cones (short- and long-wavelength cones respectively) that worsen headache. Narrowband green light at 520 ± 10nm activates a different set of cones (medium-wavelength) that ameliorate it.
In plain English: blue light triggers migraine. Red light also triggers migraine. Only narrowband green light has been shown to reduce it.
That’s why this lamp exists, and why it isn’t part of our Healthy Lighting ranges. Amber and red lighting are excellent for general healthy evening lighting and sleep, but for someone experiencing active head pain, they can be triggers rather than relief.
Q. Is this a medical device?
A. No. The CALM Green Light bulb range is general household lighting, designed to support people whose head pain is triggered or worsened by standard lighting. It is not a medical device and is not intended to diagnose, treat, or replace any medication or clinical advice. For ongoing migraine management, please speak with your GP or neurologist.
Q. How does the E14 candle bulb differ from the other CALM Green bulbs?
A. The light output (narrowband 520nm, 1.5% blue) is the same. The difference is brightness and fitting:
- E14 candle (3W, 180 lumens) small candle-shaped bulb, softer glow, suited to chandeliers, wall sconces, and decorative fittings
- E14 round (5W, 300 lumens) small round bulb, brighter than the candle, suited to bedside lamps and small fittings
- E27 (7W, 420 lumens) large screw fitting, suited to ceiling lights and main room lighting
- B22 (7W, 420 lumens) bayonet cap, the traditional UK fitting found in many older homes
Q. How long does it take to see results?
A. The Arizona research protocol involved daily exposure to narrowband green light for around 10 weeks. Some people notice immediate relief during an active migraine; the reduction in attack frequency tends to build over weeks of regular use.
Clinical References for 520nm Narrowband Green Light
CHIRYŌ Light Therapy: Healthy Lighting FREE downloadable guide healthy lighting guide
Evaluation of green light exposure on headache frequency and quality of life in migraine patients Cephalalgia, 2020. First human clinical trial of green light therapy for migraine. 60% average reduction in headache days, with 86% of episodic and 63% of chronic migraine patients reporting over 50% improvement.
Narrow band green light effects on headache, photophobia, sleep, and anxiety among migraine patients Frontiers in Neurology, 2023. 181 migraine patients. Headache improved in 55% of all attacks treated, photophobia improved in 53%, sleep improved in 49%, anxiety improved in 34%.
Migraine photophobia originating in cone-driven retinal pathways Brain (Harvard Medical School), 2016. Identified the cone-driven retinal pathway behind migraine photophobia. Green light reduced pain by approximately 20%; blue and red light worsened it.
Green Light Exposure Improves Pain and Quality of Life in Fibromyalgia Patients Pain Medicine, 2021. Average pain intensity reduced from 8.4 to 4.9 on a 10-point scale during green light exposure compared with white light.
Green Light Therapy Shown to Reduce Migraine Frequency, Intensity University of Arizona Health Sciences, 2020. Plain-English institutional summary of Dr Mohab Ibrahim’s clinical research with lead-author quotes.
About CHIRYŌ Light Therapy
CHIRYŌ Light Therapy is a UK brand based in Bristol, specialising in blue-light-free home lighting and LED light therapy devices. The Healthy Lighting range was developed by a founder with approximately twenty years of professional experience in mental health and neurodivergence support, after seeing first-hand how rarely families are given practical, environment-based tools to support sleep and health.
In-home lighting consultations are available in Bristol and the surrounding area.
This product is general household lighting designed to support a low-blue-light evening environment. It is not a medical device and is not intended to diagnose, treat, or replace any medication or clinical advice.
Reviewed by CHIRYŌ Light Therapy May 2026 – Specialists in Healthy Lighting and FDA-cleared blue, red, and near-infrared LED light therapy devices.
Specifications
CALM Green 520nm Candle Light Bulb (E14)
- Bulb Colour: Narrowband Green
- Peak Wavelength: 520nm
- Bulb Type: LED Candle
- Connection Type: E14 small screw candle (UK / EU)
- Brightness: 3W, softer glow for evening and recovery use
- Lumens: 180lm (15W equivalent)
- Blue Light Content: 1.5%
- Dimming: Non-dimmable
- Power Input: AC100-240V 50/60Hz
- Flicker: 100% Flicker-Free and Low EMF
- Lifespan: Approximately 20,000 Hours
- Warranty: 2 Years
- Certification: CE, RoHS
- Also Available In: E14 round bulb, E27 large screw, B22 bayonet
Additional information
| Weight | 0.03 kg |
|---|---|
| Dimensions | 10.5 × 3.5 × 10.5 cm |
| Fitting Type |
Reviews (6)
6 reviews for Headaches & Migraines | Calm Green 520nm E14 Candle Light Bulb
| 5 star | 66% | |
| 4 star | 33% | |
| 3 star | 0% | |
| 2 star | 0% | |
| 1 star | 0% |
Headaches & Migraines | Calm Green 520nm E14 Candle Light Bulb
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Really impressed with the soft green tone. I originally bought it for my office but ended up moving it into the living room because it creates such a calm environment.
[...]No issues, nice in wall lights
[...]Highly recommend this bulb for relaxation.
[...]Lovely bulb for my bedside lamp
[...]I use this candle bulb for meditation, and it’s so relaxing. The green light is soft but bright enough for my needs
[...]