light therapy: meaning, definition, pronunciation and examples
C1Formal, Medical, Technical
Quick answer
What does “light therapy” mean?
A medical treatment for certain conditions, especially seasonal affective disorder (SAD), that uses exposure to artificial light.
Audio
Pronunciation
Definition
Meaning and Definition
A medical treatment for certain conditions, especially seasonal affective disorder (SAD), that uses exposure to artificial light.
Any therapeutic practice involving exposure to specific wavelengths of light, such as bright light therapy for circadian rhythm disorders or blue/red light for skin conditions. It is also used in wellness contexts for mood enhancement and energy regulation.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. The treatment is identically named. Spelling of related words may differ (e.g., 'therapise' vs. 'therapize', but the compound noun remains unchanged).
Connotations
Slightly more common in public discourse in regions with longer, darker winters (e.g., Northern UK, Pacific Northwest US).
Frequency
Comparable frequency in both varieties, with a slight increase in medical/wellness publications in the US.
Grammar
How to Use “light therapy” in a Sentence
Patient + undergo + light therapyDoctor + prescribe + light therapy + for + conditionLight therapy + help + with + symptomsVocabulary
Collocations
Examples
Examples of “light therapy” in a Sentence
verb
British English
- He was advised to light-therapise for 30 minutes each morning.
- The clinic specialises in light-therapising patients with SAD.
American English
- She light-therapizes daily during the winter months.
- The doctor recommended light-therapizing to regulate her sleep cycle.
adverb
British English
- The treatment proceeded light-therapeutically.
- She approached her routine light-therapeutically, following the protocol exactly.
American English
- He uses the lamp light-therapeutically every morning.
- The device is designed to be used light-therapeutically, not just as a regular light.
adjective
British English
- She bought a new light-therapy lamp.
- The light-therapy session was scheduled for dawn simulation.
American English
- He uses a light-therapy device from a well-known brand.
- They discussed light-therapy options with their dermatologist.
Usage
Meaning in Context
Business
Used in the wellness industry, marketing for lamps and related devices (e.g., 'Our company manufactures light therapy devices for home use').
Academic
Frequent in psychology, psychiatry, and dermatology papers discussing clinical trials and treatment efficacy.
Everyday
Discussed as a treatment for 'winter blues' or seasonal depression; mentioned in health blogs and magazines.
Technical
Precise specifications of lux, lumen, wavelength, and duration in clinical guidelines and device manuals.
Vocabulary
Synonyms of “light therapy”
Strong
Neutral
Weak
Vocabulary
Antonyms of “light therapy”
Watch out
Common Mistakes When Using “light therapy”
- Using it as a countable noun (e.g., 'I had three light therapies last week' – should be 'three light therapy sessions').
- Confusing 'light therapy' (general) with 'photodynamic therapy' (specific cancer/skin treatment using light-sensitive drugs).
FAQ
Frequently Asked Questions
No, they are different. Medical light therapy boxes filter out harmful UV rays, while tanning beds emit UV radiation specifically for skin tanning, which carries significant health risks.
Many people report noticing some improvement in energy and mood within a few days to a week, but it can take several weeks of consistent use for the full effect.
Natural sunlight is beneficial, but light therapy provides a controlled dose of specific, bright light without UV exposure, making it a consistent and safe treatment option regardless of weather or season.
Side effects are usually mild and may include eyestrain, headache, nausea, or irritability. These often subside with time or by reducing the duration of exposure. It is important to use devices as directed.
A medical treatment for certain conditions, especially seasonal affective disorder (SAD), that uses exposure to artificial light.
Light therapy is usually formal, medical, technical in register.
Light therapy: in British English it is pronounced /ˈlaɪt ˌθer.ə.pi/, and in American English it is pronounced /ˈlaɪt ˌθer.ə.pi/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think: 'Light to make you bright' – using light to brighten mood and alleviate symptoms.
Conceptual Metaphor
LIGHT IS MEDICINE / LIGHT IS A CURE (e.g., 'bathing in healing light').
Practice
Quiz
Which of the following is NOT a typical application of light therapy?