LIGHT, EXPLAINED
Light on a dark winter commute: trains, buses and 7 am starts
A 7 am commute is in the dark from October to late February in London and from September to March in Glasgow. How to get morning light before...
Read the story ↗THE DAYARC JOURNAL
The DAYARC Journal
Clear explanations. Practical details. A considered start to your day.
LIGHT, EXPLAINED
How long does a light therapy lamp last? LED lifespan, cleaning and care
LED lamps fade rather than fail: an L70 rating means tens of thousands of hours, decades at 30 minutes a day. What wears out first, how to clean...
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LIGHT, EXPLAINED
Is my SAD lamp bright enough? How lux is measured and why phone apps mislead
Studies found phone lux apps extremely variable and up to 38 per cent out. How to check a SAD lamp is bright enough using the stated distance, panel...
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LIGHT, EXPLAINED
Your first two weeks with a SAD lamp: what to expect day by day
What to expect in your first fortnight with a SAD lamp: settling in, the side effects to adjust for, keeping a fixed wake time, and how to judge...
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LIGHT, EXPLAINED
Winter daylight in Shetland and Orkney: the shortest days in the UK
Lerwick gets 5 hours 48 minutes of daylight on the shortest day and sunrise after 9 am for a month. Winter sunrise, sunset and day length for Shetland...
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LIGHT, EXPLAINED
Why do the clocks change? A short history of British Summer Time
From William Willett's 1907 pamphlet to the 1916 Act, the 1968–71 experiment and the 1972 law that still sets the dates: why the UK's clocks change, and what...
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LIGHT, EXPLAINED
How bright is a cloudy day in the UK? Lux levels of daylight, offices and homes compared
An overcast day is about 1,000 lux, direct sun up to 100,000, an office 320 to 500 and a living room around 50. How daylight, rooms and a...
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LIGHT, EXPLAINED
When should you stop using a SAD lamp in spring?
Stop when the sun is up before you are: late February in London, early March in Manchester and Belfast. City-by-city dates, whether to taper, and who keeps going.
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LIGHT, EXPLAINED
Is it too late to start using a SAD lamp in January?
January has the darkest mornings of the year in the UK, with sunrise after 8 am until mid-January in London and mid-February in the north. Why a January...
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LIGHT, EXPLAINED
How quickly do the days get shorter in the UK after the autumn equinox?
Around the equinox London loses almost four minutes of daylight a day and Shetland five and a half. Week-by-week figures for the 2026 autumn, and what they mean...
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LIGHT, EXPLAINED
Which is the darkest month in the UK? Daylight and sunshine, month by month
December is the darkest month in the UK by daylight and by sunshine, with 42.7 hours on average. How every month compares, and why January mornings feel worse.
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LIGHT, EXPLAINED
Winter sunrise times across the UK: London, Cardiff, Belfast, Newcastle and Inverness compared
Sunrise on the shortest day is 08:04 in London, 08:44 in Belfast and 08:57 in Inverness. Full tables of winter sunrise, sunset, daylight and dark mornings for 14...
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Which morning
looks like yours?
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