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Blackout curtains and blinds
Blackout curtains and blinds: blackout, dimout and "room darkening" are three different light transmissions sold as one, and the gap at the side ruins all…
This launch guide maps the topic, the source base and the practical questions. Check the linked official authority before acting on a rule, deadline, price or safety requirement.
What this guide covers
Blackout, dimout and "room darkening" are three different light transmissions sold as one, and the gap at the side ruins all three — the page names the three fixes that actually work.
The Nordic hook is computed from our own sunrise data: how much light enters a Tallinn or Helsinki bedroom at 03:00 in June, set against the published recommendation of under one lux in a sleeping room and a phone-based way to test it. ~13 item pages including measuring, coated versus three-pass fabric, rental-friendly and travel blackout, thermal claims, shift-worker setups, and the morning-light argument against blacking out a nursery.
How to use it
Use Blackout curtains and blinds to understand the inputs, units and assumptions before relying on an output. A useful result should be reproducible from the named source rather than presented as an unexplained score.
The page keeps the main question, its evidence base and its limits together in one canonical place. That makes it useful as a quick orientation and avoids splitting a broad subject into shallow pages before each narrower answer has enough verified material of its own.
Search vocabulary in four languages
Terminology changes across borders. These are example phrases people use for the same subject in Estonian, Finnish, Russian and English; they are included as a practical vocabulary aid, not as hidden keywords.
| Language | Example phrase |
|---|---|
| Estonian | pimenduskardinad kas aitavad magada |
| Finnish | pimennysverhot uni |
| Russian | шторы блэкаут для сна |
| English | how dark should a bedroom be to sleep |
Evidence and provenance
The evidence map below records the primary, official or openly licensed material chosen for this guide. It is deliberately visible so a reader can tell the difference between a rule published by an authority, a measured dataset and an editorial explanation.
Source: Brown et al. 2022 light recommendations (PLOS Biology, CC BY), EN 13125 thermal resistance of shutters and blinds (catalogue abstract), published fabric light-transmission test data (cited); sunrise geometry computed from our own astronomy code. · checked 2026-09-09
Source names are preserved even where an authority changes its web address. No figure is added to this launch page unless it is already present in the cited source description or can be computed from a named dataset.
Scope and boundaries
This guide owns the explanatory layer for the topic. Personal decisions, diagnoses, legal determinations and live availability remain with the relevant professional or official service.
Connected TempoLife guides
The following paths are the intentional hand-offs named in the brief. They keep adjacent subjects separate while making the next useful reference easy to find.
Insomnia
Continue to the related TempoLife reference.
Shift
Continue to the related TempoLife reference.
Why it belongs on TempoLife
/bedtime, /insomnia, /shift, /sunrise-sunset.
Frequently asked questions
What does this guide cover?
Blackout, dimout and "room darkening" are three different light transmissions sold as one, and the gap at the side ruins all three — the page names the three fixes that actually work. The Nordic hook is computed from our own sunrise data: how much light enters a Tallinn or Helsinki bedroom at 03:00 in June, set against the published recommendation of under one lux in a sleeping room and a phone-based way to test it. ~13 item pages including measuring, coated versus three-pass fabric, rental-friendly and travel…
What evidence does it use?
Brown et al. 2022 light recommendations (PLOS Biology, CC BY), EN 13125 thermal resistance of shutters and blinds (catalogue abstract), published fabric light-transmission test data (cited); sunrise geometry computed from our own astronomy code.
Where does this guide stop?
It explains the topic and points to primary or official sources. It does not replace a qualified professional, an official decision, or advice based on your own circumstances.
Turn the reference into a routine
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