Loading DSGNBRF…
We are retrieving the latest information.
Fixture Specification Checker
Record the evidence in a datasheet, compare two luminaires or practise interpreting specifications. Findings guide questions to suppliers; they do not certify compliance.
03 · READ THE DATASHEET
Fixture Specification Checker
Understand the declaration, record its source and identify questions to investigate. This does not rate, certify or approve a product.
Understand reviews one declared specification. Compare examines two user-entered fixtures side by side. Learn offers short, evidence-linked datasheet exercises.
Every field is optional. Empty fields start as Not checked. Choose Not stated only after reviewing the indicated source. Entered claims and reported documents are not independently verified.
01 — Light output and energy
What it means: 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.
What to check: Include the driver and the stated operating condition.
What to ask the supplier: What is the complete luminaire input power at the declared output?
Explore the Lighting Knowledge LibraryWhat it means: The total luminous output stated for the complete luminaire.
Why it matters: Use luminaire output, not only the LED source value, when comparing products.
What to check: Use delivered luminaire output, not LED-chip or bare-source lumens.
What to ask the supplier: Are these luminaire lumens after optical and thermal losses?
Explore the Lighting Knowledge LibraryCalculated luminaire efficacy
What it means: Luminaire lumens divided by complete-luminaire system wattage.
Why it matters: It relates delivered light output to electrical input, without rating visual comfort or lighting quality.
What to check: Both inputs must be valid positive recorded values for the same product and operating point.
What to ask the supplier: Do the declared luminaire lumens and system watts describe the same tested configuration?
Explore the Lighting Knowledge LibraryLuminaire lumens ÷ system wattage. LED-chip lumens are not substituted.
02 — Colour and appearance
What it means: 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.
What to check: Check the exact variant, colour consistency and samples against finishes.
What to ask the supplier: What CCT, tolerance and colour-quality report apply to this SKU?
Explore the Lighting Knowledge LibraryWhat it means: Ra is an average colour-fidelity index calculated with a specified test-colour method and defined reference. Two sources with the same Ra can render colours differently.
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.
What to check: Ra averages specified test-colour results against a defined reference; equal Ra does not imply identical rendering.
What to ask the supplier: Can you supply R9, TM-30 data and a sample for the same variant?
Explore the Lighting Knowledge LibraryWhat it means: 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.
What to check: Check the saturated-red result alongside Ra; negative values can be reported.
What to ask the supplier: What R9 was measured for this exact CCT and light engine?
Explore the Lighting Knowledge LibraryWhat it means: TM-30 Rf describes colour fidelity against its reference; it is not a universal quality rating.
Why it matters: It adds context beyond the traditional Ra average.
What to check: Rf describes fidelity; use the stated TM-30 edition and full report.
What to ask the supplier: Can you provide the colour vector graphic and hue-bin results?
Explore the Lighting Knowledge LibraryWhat it means: TM-30 Rg describes average colour-gamut behaviour; it is not a universal quality rating.
Why it matters: It helps show whether colors may appear more or less saturated.
What to check: Rg describes average gamut behaviour, not a universal quality ranking.
What to ask the supplier: Where do local hue and saturation shifts occur in the full report?
Explore the Lighting Knowledge LibraryWhat it means: 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.
What to check: Check the nominal chromaticity, tolerance and whether the claim is initial or maintained.
What to ask the supplier: Does the consistency claim cover this batch and replacement products?
Explore the Lighting Knowledge Library03 — Distribution and visual comfort
What it means: 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.
What to check: A nominal angle does not guarantee illuminated coverage or lux; inspect photometry.
What to ask the supplier: Can you provide the measured distribution for the exact optic?
Explore the Lighting Knowledge LibraryWhat it means: 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.
What to check: Glare depends on room geometry, surfaces, observer and luminaire layout.
What to ask the supplier: What room and calculation assumptions support the published UGR statement?
Explore the Lighting Knowledge LibraryWhat it means: A short-term light-flicker metric used for temporal light modulation.
Why it matters: It is more informative than an unsupported “flicker-free” claim.
What to check: Check measurement method, supply, driver and dimming conditions.
What to ask the supplier: Can you provide the temporal-modulation test report and operating point?
Explore the Lighting Knowledge LibraryWhat it means: A measure related to the visibility of stroboscopic effects.
Why it matters: It helps review temporal modulation under the stated product conditions.
What to check: Identify the measured product, light-source classification and full-load or dimmed condition.
What to ask the supplier: What original test report and operating conditions support this SVM value?
Explore the Lighting Knowledge Library04 — Controls and documentation
What it means: 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.
What to check: Match the driver interface, controller and tested operating range.
What to ask the supplier: Which exact control device and controller pairing were tested?
Explore the Lighting Knowledge LibraryWhat it means: Lumen-maintenance notation such as L90B10 describes a stated performance claim over time. It is different from warranty duration.
Why it matters: A percentage and duration are more useful than an hours-only claim.
What to check: Keep L/B notation, hours, temperature and failure assumptions separate from warranty.
What to ask the supplier: What does the L90B10 claim cover, at what temperature and duration?
Explore the Lighting Knowledge LibraryWhat it means: A digital file describing a luminaire’s measured light distribution.
Why it matters: A lighting professional can use it for a project-specific calculation.
What to check: Match the file to the exact luminaire, optic, CCT and output setting.
What to ask the supplier: Can you supply the exact IES or LDT file and its revision?
Explore the Lighting Knowledge LibraryWhat it means: The warranty duration and conditions published for the exact product.
Why it matters: Territory, exclusions and product family can affect what the warranty covers.
What to check: Read duration, territory, exclusions and remedy; warranty is not lumen maintenance.
What to ask the supplier: What terms apply to this SKU, installation and market?
Explore the Lighting Knowledge LibraryWhat it means: 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.
What to check: Match document identity, model, scope, issuing body and jurisdiction.
What to ask the supplier: Can you supply the applicable documents and explain their exact product scope?
Explore the Lighting Knowledge LibrarySource identification
User-entered; not independently verified.
- Manufacturer
- Not supplied
- Exact model / SKU
- Not supplied
- Product type
- Unknown
- Revision / publication date
- Not supplied
- Reference URL
- Not supplied
Information recorded
No specifications recorded yet.
Calculated information
No calculated efficacy: valid positive recorded watts and luminaire lumens are required.
Items to investigate
- Source traceability is incomplete: manufacturer, exact model / SKU, datasheet revision/date or reference URL. A preliminary review is still available.
Not stated / not found in checked material
None explicitly marked as not found.
Not checked
- System wattage
- Luminaire lumens
- CCT
- CRI / Ra
- R9
- TM-30 Rf
- TM-30 Rg
- SDCM
- Beam angle
- Glare / UGR information
- PstLM
- SVM
- Dimming protocol
- Lifetime data
- IES / LDT photometric file
- Warranty
- Product conformity / certification documentation
Enter each fixture from its own source. Claims remain user-entered, calculations are labelled, and incomplete product identity keeps the comparison preliminary.
Preliminary comparison: enter the manufacturer and exact model/SKU for both fixtures.
Fixture A
Fixture B
01 — Light output and energy
Fixture A
What it means: 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.
What to check: Include the driver and the stated operating condition.
What to ask the supplier: What is the complete luminaire input power at the declared output?
Explore the Lighting Knowledge LibraryWhat it means: The total luminous output stated for the complete luminaire.
Why it matters: Use luminaire output, not only the LED source value, when comparing products.
What to check: Use delivered luminaire output, not LED-chip or bare-source lumens.
What to ask the supplier: Are these luminaire lumens after optical and thermal losses?
Explore the Lighting Knowledge LibraryCalculated luminaire efficacy
What it means: Luminaire lumens divided by complete-luminaire system wattage.
Why it matters: It relates delivered light output to electrical input, without rating visual comfort or lighting quality.
What to check: Both inputs must be valid positive recorded values for the same product and operating point.
What to ask the supplier: Do the declared luminaire lumens and system watts describe the same tested configuration?
Explore the Lighting Knowledge LibraryCalculated within this fixture only when positive recorded luminaire lumens and system watts are available.
Fixture B
What it means: 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.
What to check: Include the driver and the stated operating condition.
What to ask the supplier: What is the complete luminaire input power at the declared output?
Explore the Lighting Knowledge LibraryWhat it means: The total luminous output stated for the complete luminaire.
Why it matters: Use luminaire output, not only the LED source value, when comparing products.
What to check: Use delivered luminaire output, not LED-chip or bare-source lumens.
What to ask the supplier: Are these luminaire lumens after optical and thermal losses?
Explore the Lighting Knowledge LibraryCalculated luminaire efficacy
What it means: Luminaire lumens divided by complete-luminaire system wattage.
Why it matters: It relates delivered light output to electrical input, without rating visual comfort or lighting quality.
What to check: Both inputs must be valid positive recorded values for the same product and operating point.
What to ask the supplier: Do the declared luminaire lumens and system watts describe the same tested configuration?
Explore the Lighting Knowledge LibraryCalculated within this fixture only when positive recorded luminaire lumens and system watts are available.
02 — Colour and appearance
Fixture A
What it means: 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.
What to check: Check the exact variant, colour consistency and samples against finishes.
What to ask the supplier: What CCT, tolerance and colour-quality report apply to this SKU?
Explore the Lighting Knowledge LibraryWhat it means: Ra is an average colour-fidelity index calculated with a specified test-colour method and defined reference. Two sources with the same Ra can render colours differently.
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.
What to check: Ra averages specified test-colour results against a defined reference; equal Ra does not imply identical rendering.
What to ask the supplier: Can you supply R9, TM-30 data and a sample for the same variant?
Explore the Lighting Knowledge LibraryWhat it means: 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.
What to check: Check the saturated-red result alongside Ra; negative values can be reported.
What to ask the supplier: What R9 was measured for this exact CCT and light engine?
Explore the Lighting Knowledge LibraryWhat it means: TM-30 Rf describes colour fidelity against its reference; it is not a universal quality rating.
Why it matters: It adds context beyond the traditional Ra average.
What to check: Rf describes fidelity; use the stated TM-30 edition and full report.
What to ask the supplier: Can you provide the colour vector graphic and hue-bin results?
Explore the Lighting Knowledge LibraryWhat it means: TM-30 Rg describes average colour-gamut behaviour; it is not a universal quality rating.
Why it matters: It helps show whether colors may appear more or less saturated.
What to check: Rg describes average gamut behaviour, not a universal quality ranking.
What to ask the supplier: Where do local hue and saturation shifts occur in the full report?
Explore the Lighting Knowledge LibraryWhat it means: 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.
What to check: Check the nominal chromaticity, tolerance and whether the claim is initial or maintained.
What to ask the supplier: Does the consistency claim cover this batch and replacement products?
Explore the Lighting Knowledge LibraryFixture B
What it means: 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.
What to check: Check the exact variant, colour consistency and samples against finishes.
What to ask the supplier: What CCT, tolerance and colour-quality report apply to this SKU?
Explore the Lighting Knowledge LibraryWhat it means: Ra is an average colour-fidelity index calculated with a specified test-colour method and defined reference. Two sources with the same Ra can render colours differently.
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.
What to check: Ra averages specified test-colour results against a defined reference; equal Ra does not imply identical rendering.
What to ask the supplier: Can you supply R9, TM-30 data and a sample for the same variant?
Explore the Lighting Knowledge LibraryWhat it means: 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.
What to check: Check the saturated-red result alongside Ra; negative values can be reported.
What to ask the supplier: What R9 was measured for this exact CCT and light engine?
Explore the Lighting Knowledge LibraryWhat it means: TM-30 Rf describes colour fidelity against its reference; it is not a universal quality rating.
Why it matters: It adds context beyond the traditional Ra average.
What to check: Rf describes fidelity; use the stated TM-30 edition and full report.
What to ask the supplier: Can you provide the colour vector graphic and hue-bin results?
Explore the Lighting Knowledge LibraryWhat it means: TM-30 Rg describes average colour-gamut behaviour; it is not a universal quality rating.
Why it matters: It helps show whether colors may appear more or less saturated.
What to check: Rg describes average gamut behaviour, not a universal quality ranking.
What to ask the supplier: Where do local hue and saturation shifts occur in the full report?
Explore the Lighting Knowledge LibraryWhat it means: 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.
What to check: Check the nominal chromaticity, tolerance and whether the claim is initial or maintained.
What to ask the supplier: Does the consistency claim cover this batch and replacement products?
Explore the Lighting Knowledge Library03 — Distribution and visual comfort
Fixture A
What it means: 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.
What to check: A nominal angle does not guarantee illuminated coverage or lux; inspect photometry.
What to ask the supplier: Can you provide the measured distribution for the exact optic?
Explore the Lighting Knowledge LibraryWhat it means: 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.
What to check: Glare depends on room geometry, surfaces, observer and luminaire layout.
What to ask the supplier: What room and calculation assumptions support the published UGR statement?
Explore the Lighting Knowledge LibraryWhat it means: A short-term light-flicker metric used for temporal light modulation.
Why it matters: It is more informative than an unsupported “flicker-free” claim.
What to check: Check measurement method, supply, driver and dimming conditions.
What to ask the supplier: Can you provide the temporal-modulation test report and operating point?
Explore the Lighting Knowledge LibraryWhat it means: A measure related to the visibility of stroboscopic effects.
Why it matters: It helps review temporal modulation under the stated product conditions.
What to check: Identify the measured product, light-source classification and full-load or dimmed condition.
What to ask the supplier: What original test report and operating conditions support this SVM value?
Explore the Lighting Knowledge LibraryFixture B
What it means: 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.
What to check: A nominal angle does not guarantee illuminated coverage or lux; inspect photometry.
What to ask the supplier: Can you provide the measured distribution for the exact optic?
Explore the Lighting Knowledge LibraryWhat it means: 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.
What to check: Glare depends on room geometry, surfaces, observer and luminaire layout.
What to ask the supplier: What room and calculation assumptions support the published UGR statement?
Explore the Lighting Knowledge LibraryWhat it means: A short-term light-flicker metric used for temporal light modulation.
Why it matters: It is more informative than an unsupported “flicker-free” claim.
What to check: Check measurement method, supply, driver and dimming conditions.
What to ask the supplier: Can you provide the temporal-modulation test report and operating point?
Explore the Lighting Knowledge LibraryWhat it means: A measure related to the visibility of stroboscopic effects.
Why it matters: It helps review temporal modulation under the stated product conditions.
What to check: Identify the measured product, light-source classification and full-load or dimmed condition.
What to ask the supplier: What original test report and operating conditions support this SVM value?
Explore the Lighting Knowledge Library04 — Controls and documentation
Fixture A
What it means: 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.
What to check: Match the driver interface, controller and tested operating range.
What to ask the supplier: Which exact control device and controller pairing were tested?
Explore the Lighting Knowledge LibraryWhat it means: Lumen-maintenance notation such as L90B10 describes a stated performance claim over time. It is different from warranty duration.
Why it matters: A percentage and duration are more useful than an hours-only claim.
What to check: Keep L/B notation, hours, temperature and failure assumptions separate from warranty.
What to ask the supplier: What does the L90B10 claim cover, at what temperature and duration?
Explore the Lighting Knowledge LibraryWhat it means: A digital file describing a luminaire’s measured light distribution.
Why it matters: A lighting professional can use it for a project-specific calculation.
What to check: Match the file to the exact luminaire, optic, CCT and output setting.
What to ask the supplier: Can you supply the exact IES or LDT file and its revision?
Explore the Lighting Knowledge LibraryWhat it means: The warranty duration and conditions published for the exact product.
Why it matters: Territory, exclusions and product family can affect what the warranty covers.
What to check: Read duration, territory, exclusions and remedy; warranty is not lumen maintenance.
What to ask the supplier: What terms apply to this SKU, installation and market?
Explore the Lighting Knowledge LibraryWhat it means: 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.
What to check: Match document identity, model, scope, issuing body and jurisdiction.
What to ask the supplier: Can you supply the applicable documents and explain their exact product scope?
Explore the Lighting Knowledge LibraryFixture B
What it means: 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.
What to check: Match the driver interface, controller and tested operating range.
What to ask the supplier: Which exact control device and controller pairing were tested?
Explore the Lighting Knowledge LibraryWhat it means: Lumen-maintenance notation such as L90B10 describes a stated performance claim over time. It is different from warranty duration.
Why it matters: A percentage and duration are more useful than an hours-only claim.
What to check: Keep L/B notation, hours, temperature and failure assumptions separate from warranty.
What to ask the supplier: What does the L90B10 claim cover, at what temperature and duration?
Explore the Lighting Knowledge LibraryWhat it means: A digital file describing a luminaire’s measured light distribution.
Why it matters: A lighting professional can use it for a project-specific calculation.
What to check: Match the file to the exact luminaire, optic, CCT and output setting.
What to ask the supplier: Can you supply the exact IES or LDT file and its revision?
Explore the Lighting Knowledge LibraryWhat it means: The warranty duration and conditions published for the exact product.
Why it matters: Territory, exclusions and product family can affect what the warranty covers.
What to check: Read duration, territory, exclusions and remedy; warranty is not lumen maintenance.
What to ask the supplier: What terms apply to this SKU, installation and market?
Explore the Lighting Knowledge LibraryWhat it means: 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.
What to check: Match document identity, model, scope, issuing body and jurisdiction.
What to ask the supplier: Can you supply the applicable documents and explain their exact product scope?
Explore the Lighting Knowledge LibraryCan you spot what the datasheet doesn’t tell you?
Work through one reviewed question at a time. Your answers are not stored.
Question 1 of 5
A supplier lists an LED engine and a complete luminaire.
Which wattage should you record when comparing the luminaire’s declared input power?
Review the related datasheet field: System wattage
What it means: 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.
What to check: Include the driver and the stated operating condition.
What to ask the supplier: What is the complete luminaire input power at the declared output?
Explore the Lighting Knowledge Library