Daylight and tunable white lighting
Keep natural daylight, adjustable colour and claimed benefits distinct in a specification.
Terms such as daylight, full spectrum and human-centred lighting can describe different ideas in different offers. Translate the intended function into product information, adjustment behaviour and a room-based review.
Define the terms
Record whether the brief concerns daylight entering through windows, the appearance of artificial light or an adjustable white-light configuration. Ask the supplier what each term means in the offer and which information supports it.
A marketing name should not be taken to mean that an LED source duplicates sunlight or provides a health effect. Keep those questions separate from the ordinary lighting task.
Record available settings
Request colour-temperature settings or range, colour-rendering information and any relevant spectral data. Identify the controls used to change brightness and colour, whether changes are linked and which records apply to each configuration.
Test starting settings, manual adjustment, memory and automatic operation. Do not assume tunable colour includes scheduling, connectivity or a particular platform.
Review the room and schedule
Document windows, screens, work materials and other lighting. Review the proposed settings at the occupied position and record the room conditions. If a schedule is part of the brief, agree who defines it, how users override it and how settings are handed over.
The home-office layout guide and office planning guide help put the luminaire into context.
Separate claims from evidence
Ask for the exact evidence, conditions and product reference behind any wellbeing or circadian claim. Colour data and a comfortable sample review alone do not establish effects on sleep, health or productivity.
Use the comfort-claims checklist for evidence questions. For product configuration, share the required settings and control behaviour.