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See how color temperature changes a space, check a luminaire specification, estimate beam spread and learn what matters before purchasing.
Don’t choose a light fixture by Kelvin and wattage alone.
THREE INTERACTIVE STUDIOS
Change the optics, not the interior.
Start with the track spotlight: compare 15°, 24° and 36° on the garments, then switch to the wallwasher for continuous vertical illumination. CCT alone cannot predict garment colour rendering.
Illustrative lighting preview. Appearance depends on the actual luminaire, optics, spectrum, room surfaces and viewing conditions. This is not a photometric simulation.
Compare the same kind of room under five white-light appearances. Colour temperature can shape a room’s mood impression: warm whites are often read as intimate or restful, neutral whites as balanced, and cooler whites as crisp or task-focused. These are tendencies, not guaranteed effects of Kelvin alone; brightness, spectrum and colour rendering, contrast, finishes, time of day and personal response also matter.
2700 K · Warm white
Warm and familiar for residential settings.
Often works well with timber, warm stone, brass and beige fabrics.
Warm appearance alone says nothing about color rendition, tint or glare. Do not assume all 2700K products will look the same; compare Duv and color quality.
Treat CCT first as an atmosphere and materials decision. Compare the actual fixture against the room finishes. CCT alone does not describe colour rendering, brightness, glare, flicker or the source spectrum.
Illustrative preview only. Local fixture and reflected-light effects show relative warm-to-cool character; this is not a photometric or spectral simulation.
Switch each source on or off to see how a room can support different moments without asking one ceiling light to do everything.
Sets the room’s general light level through broad ceiling or reflected light.
Where: Often above eye level: bounced from the ceiling or delivered by a broad pendant.
Colour tendency: Warmer white often suits a relaxed evening; a more neutral white can support active, shared use.
Washes the ceiling to soften transitions and make the room feel more even.
Where: Conceal the source at a ceiling edge or recess and aim it onto the ceiling.
Colour tendency: Warm light can feel softer; neutral light may sit better with cooler finishes. Check for bright bands.
Adds a local pool of light and a smaller, more personal source near seating.
Where: Beside a sofa or chair, with a shade or diffuser keeping the bright source out of direct view.
Colour tendency: Warm white around 2700–3000 K is a familiar evening starting point; choose by preference and materials.
Draws attention to artwork, a textured wall, joinery or another chosen feature.
Where: Aim from above or at an oblique angle; check the surface for glare and unwanted reflections.
Colour tendency: Warm light can support warm materials; a more neutral appearance may suit cooler artwork and finishes.
Puts useful local light on a book or other close activity without brightening the whole room.
Where: Place beside or slightly behind the reader and keep the source out of the direct line of sight.
Colour tendency: Warm can feel relaxed; neutral may appear crisper for print. Check comfort, glare and the actual task.
Enter what a manufacturer publishes. This organizes information to review; it does not rate, certify or approve a product.
Enter only values shown for the exact product. Every field is optional; leave any field blank when the datasheet does not state it.
What it is: Electrical power for the complete luminaire, including its driver.
Why it matters: It helps compare connected load and power use; wattage alone does not tell you how much light reaches a surface.
Value guide: Research example: 18 W. Copy the complete-luminaire value for the exact model; this is not a target.
Optional: Leave blank when the exact datasheet does not provide it.
What it is: The total luminous output stated for the complete luminaire.
Why it matters: Use luminaire output, not only the LED source value, when comparing products.
Value guide: Research example: 1,650 lm from the complete luminaire. Check that the datasheet does not show only LED-source output.
Optional: Leave blank when the exact datasheet does not provide it.
What it is: Correlated color temperature: the approximate warm-to-cool appearance of white light.
Why it matters: It helps compare atmosphere and materials, but it does not describe color rendering, glare or flicker.
Value guide: Research example: 3000 K. Many products offer different values; this is an example, not a preferred setting.
Optional: Leave blank when the exact datasheet does not provide it.
What it is: The traditional general color-rendering index, written Ra or CRI.
Why it matters: It is a useful first comparison, but it does not describe every color effect; review R9 or TM-30 data where relevant.
Value guide: Research example: Ra 92. Do not treat the example as a pass mark or complete color-quality verdict.
Optional: Leave blank when the exact datasheet does not provide it.
What it is: A supplementary color-rendering index for a saturated red test color.
Why it matters: It is often checked alongside Ra when reds and skin appearance matter.
Value guide: Research example: 65. Record the published number; this tool sets no acceptance threshold.
Optional: Leave blank when the exact datasheet does not provide it.
What it is: IES TM-30 color-fidelity metric across a broader set of test colors.
Why it matters: It adds context beyond the traditional Ra average.
Value guide: Research example: Rf 91. Use the value and edition stated in the product data; no pass mark is implied.
Optional: Leave blank when the exact datasheet does not provide it.
What it is: IES TM-30 gamut metric describing average color saturation change.
Why it matters: It helps show whether colors may appear more or less saturated.
Value guide: Research example: Rg 99. It describes average gamut change, not a stand-alone quality score.
Optional: Leave blank when the exact datasheet does not provide it.
What it is: A measure of chromaticity consistency between sources with the same nominal specification.
Why it matters: It matters when several visible luminaires need to look consistent.
Value guide: Research example: 2 steps. Record the declared tolerance; this tool does not define a universal acceptable value.
Optional: Leave blank when the exact datasheet does not provide it.
What it is: The nominal angular spread of the luminaire’s main beam.
Why it matters: It helps compare how broadly a spotlight distributes light; real distributions are not hard-edged cones.
Value guide: Research example: 24°. The guide also compares 15° and 36° optics; the actual distribution comes from photometric data.
Optional: Leave blank when the exact datasheet does not provide it.
What it is: The glare-related information stated by a manufacturer or lighting calculation.
Why it matters: A catalogue value alone does not guarantee the result in the installed room.
Value guide: Copy the exact wording and conditions. A catalogue statement such as “UGR <19” is not a guarantee for every room.
Optional: Leave blank when the exact datasheet does not provide it.
What it is: A short-term light-flicker metric used for temporal light modulation.
Why it matters: It is more informative than an unsupported “flicker-free” claim.
Value guide: Enter the published value and any stated test conditions. No universal range is set here.
Optional: Leave blank when the exact datasheet does not provide it.
What it is: A measure related to the visibility of stroboscopic effects.
Why it matters: It helps review temporal modulation under the stated product conditions.
Value guide: Enter the published value and any stated test conditions. No universal range is set here.
Optional: Leave blank when the exact datasheet does not provide it.
What it is: The dimming and control interface supported by the driver.
Why it matters: It needs to match the intended controller; compatibility and certification are not the same claim.
Value guide: Examples include phase dimming, 0–10 V, 1–10 V, DALI-2 or Casambi. Copy the exact published claim.
Optional: Leave blank when the exact datasheet does not provide it.
What it is: A lumen-maintenance or lifetime statement with its stated operating conditions.
Why it matters: A percentage and duration are more useful than an hours-only claim.
Value guide: Research example: L90B10 at 50,000 h. Preserve the exact L/B notation, duration and stated conditions.
Optional: Leave blank when the exact datasheet does not provide it.
What it is: A digital file describing a luminaire’s measured light distribution.
Why it matters: A lighting professional can use it for a project-specific calculation.
Value guide: Record whether the exact luminaire file is available, unavailable or not stated.
Optional: Leave blank when the exact datasheet does not provide it.
What it is: The warranty duration and conditions published for the exact product.
Why it matters: Territory, exclusions and product family can affect what the warranty covers.
Value guide: Research example: 5 years. Copy the exact term and conditions for the model and market.
Optional: Leave blank when the exact datasheet does not provide it.
What it is: The conformity or safety documents available for the product and its exact model.
Why it matters: Check the documents against the project jurisdiction and SKU; this tool does not verify them.
Value guide: Use the exact document or conformity claim for the SKU and project jurisdiction; no universal certification is assumed.
Optional: Leave blank when the exact datasheet does not provide it.
“DALI-2 certified” and “DALI compatible / DALI interface” are different claims. Check certification for the exact model.
Enter datasheet values to see which information is present.
Estimate the diameter of an idealized symmetrical beam where it meets a target plane.
Actual photometric distribution is not a hard-edged cone. The manufacturer’s candela curve or IES/LDT file is authoritative.
Use explicit inputs for the lumen method. No utilization or maintenance factor is hidden in the result.
N ≈ (E × A) / (F × UF × MF)
N is the approximate luminaire count; E is target lux; A is area; F is luminaire lumens. UF and MF must be justified for the room and maintenance conditions.
Enter all five values to calculate an indicative quantity.
Indicative planning result only. Final luminaire quantity, uniformity, glare and compliance should be checked using actual photometric data and an appropriate professional lighting calculation workflow. A lux target alone does not establish ISO/CIE compliance.
These are application guides and comparison points—not universal requirements.
Treat a living room as a set of activities and material relationships, not a ceiling grid.
Comfort comes from how light is delivered as much as from the number shown in lux.
Retail lighting should make products legible and desirable through color, contrast and distribution—not blanket brightness.
Definitions are concise orientation, not substitutes for standards or product-specific data.
25 terms
An approximate warm/cool appearance of nominally white light, expressed in kelvin. CCT does not specify color rendition, brightness, glare, flicker or spectrum.
A traditional index comparing object-color appearance under a test source with a reference. Useful, but not a complete description of color quality.
Luminous flux: the amount of visible light emitted by a source or luminaire.
Illuminance: luminous flux per unit area. One lux is one lumen per square metre.
The nominal angular spread of a luminaire’s main beam. Real distributions are not hard-edged cones.
Control of light output. The driver, control protocol, luminaire and installation must be compatible.
A supplemental color-rendering index for a saturated red sample. It can matter where red appearance is important, but it is not a stand-alone quality verdict.
IES measures for color rendition. Rf describes average fidelity; Rg describes average gamut area. Neither single value replaces the full product/application review.
A reference curve associated with chromaticities of Planckian radiators at different temperatures; CCT is described relative to this locus.
Distance from the Planckian locus in chromaticity space. Similar CCTs can have different tints; positive and negative values indicate opposite sides of the locus.
How a light source’s radiant energy is distributed across wavelengths. It affects color rendition and visual character.
Luminous intensity in a particular direction; useful for understanding directional light such as a spotlight.
Luminaire luminous flux divided by system power. Compare complete luminaire output and wattage, not just LED-chip figures.
A method for evaluating discomfort glare in indoor installations. It depends on room geometry, surfaces, observer positions and luminaire arrangement.
A measure of chromaticity consistency between nominally similar light sources. Lower variation can matter when several fixtures are visible together; it is not a universal mandatory threshold.
Changes in light output over time. Effects may be visible or camera-detectable; vague “flicker free” claims do not replace measured data.
A metric related to short-term flicker severity under defined measurement conditions. Applicable limits depend on jurisdiction and product scope.
A metric for stroboscopic effects from temporal light modulation under defined measurement conditions.
A standardized digital lighting-control ecosystem based on the IEC 62386 series. DALI-2 certification is distinct from a general DALI-compatible interface.
Digital formats describing luminaire light distribution. They support meaningful project calculations; the actual file should match the specified product and optic.
Lifetime declarations combine a stated lumen-maintenance level, operating time and a statistical population measure. “Hours” alone is incomplete.
An enclosure protection classification for ingress of solids and water. Check it against the actual installation environment.
A classification of mechanical impact resistance where fixtures may be struck.
A compatible system deliberately becomes warmer in CCT as light output is reduced; this differs from ordinary dimming.
A system that allows CCT to be adjusted across a range. Use it where adjustable scenes are part of the project brief.
Review the luminaire, driver, evidence and actual installation as one specification.
Safety standards and certification requirements vary by product and installation jurisdiction. This checklist does not certify a luminaire.
Explore specification-oriented manufacturers by origin and application.
Directory inclusion reflects the research basis and accessible professional product information; it is not an endorsement or ranking. Availability, technical attributes and certification must be verified for each product and market.
Showing 12 of 12 manufacturers
Selected professional ranges publish CCT, CRI, SDCM, TM-30 Rf/Rg, beam angles, UGR, lumen-maintenance data and IES/LDT files.
Official manufacturer siteExtensive application guidance covers workplace visual comfort and retail optics; check actual room geometry and product photometry.
Official manufacturer siteResearch reports selected products with CRI, TM-30 Rf/Rg and DALI-2 characteristics; verify the exact product.
Official manufacturer siteCommercial and workplace specification ranges are a strong focus; verify product-level data, controls and photometry for each SKU.
Official manufacturer siteApplicable product pages may provide CCT, CRI variants, DALI/Casambi options and LDT downloads.
Official manufacturer siteResearch describes modern workplace, industrial, outdoor and connected-lighting ranges; verify photometric and control data at SKU level.
Official manufacturer siteRelevant product pages can expose wattage, CCT, beam angles and downloadable IES/photometric/technical files.
Official manufacturer siteConsumer and professional ranges are presented; check product-specific technical data and application guidance.
Official manufacturer siteThe research identifies an international commercial lighting footprint. This directory makes no claim about regional stock or individual product certification.
Official manufacturer siteResearch notes NVC products appearing in DALI certification resources; certification must be verified for the exact model.
Official manufacturer siteCommercial luminaire families include multiple color-rendering options; verify the specification for the exact product.
Official manufacturer siteResearch material includes retail and meeting-room applications; verify exact-model photometry, certification and regional availability.
Official manufacturer siteNo local distributor, stock or product certification is implied. Check the current official product information before specifying.
These references identify relevant technical frameworks; DSGNBRF does not reproduce their copyrighted tables or certify compliance.
For a real project, confirm the current edition, jurisdictional adoption and application-specific requirements with the project lighting professional.
Carry your selected fixture wattage into the existing DSGNBRF Electrical Load Estimator. This Lighting Hub does not duplicate whole-project demand calculations.