fluorescent lamp
Enable an agent to identify a fluorescent lamp, assess its operating condition and compatibility, and determine appropriate installation, maintenance and end-of-life actions.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to identify a fluorescent lamp, assess its operating condition and compatibility, and determine appropriate installation, maintenance and end-of-life actions.
A fluorescent lamp is a low-pressure mercury-vapour electric-discharge lamp in which ultraviolet radiation from the discharge excites a phosphor coating to emit visible light.
It can be Identify whether a labelled or installed light source is fluorescent and classify its configuration.; Check a proposed replacement against base, dimensions, electrical ratings and control-gear requirements.; Compare light output and colour under declared operating conditions.; Assess observed symptoms and identify which lamp, starter or ballast checks remain necessary.; Determine whether dimming or a proposed switching pattern is supported by the documented lamp-and-gear combination.; Route an intact spent lamp or broken lamp to the applicable handling and collection procedure..
Distinguishing features
The intended visible output comes primarily from a phosphor coating excited by ultraviolet radiation from a low-pressure mercury discharge.
A filament, where fitted, serves as an electrode rather than as the principal incandescent light source.
Unlike a phosphor-converted LED lamp, excitation originates in a gas discharge rather than a semiconductor emitter.
The lamp requires discharge-current limiting through compatible external or integrated control gear; its base alone does not establish electrical compatibility.
A fluorescent-shaped tube or familiar pin arrangement is insufficient identification because LED replacements can share the same physical format.
Scope
+ Recognition of fluorescent light generation and lamp construction
+ Linear, compact and other fluorescent lamp configurations
+ Electrical, mechanical and control-gear compatibility
+ Light output, operating behaviour and degradation
+ Lamp-specific handling, mercury containment and end-of-life routing
- Complete luminaires, their wiring enclosures and optical assemblies
- Standalone ballasts and starters as independently modelled devices
- LED replacement tubes and LED retrofit conversion systems
- Building lighting design and electrical distribution
- Mercury production and waste-treatment facilities
Characteristics
- Lamp configuration
- Linear tube, compact folded tube, circular tube, other documented configuration Establishes the physical arrangement without mistaking shape for electrical compatibility.
- Control-gear arrangement
- External ballast, integrated ballast, unknown Determines the boundary of the replaceable lamp and which compatibility evidence is needed.
- Base and envelope dimensions
- Base designation; overall length and envelope diameter in mm Supports mechanical fit checks and distinguishes nominal format from measured dimensions.
- Rated electrical operating point
- Lamp power in W, operating current in A and operating voltage in V; declared reference conditions Supports ballast matching while distinguishing lamp values from total system input.
- Compatible control gear
- Documented ballast, starting circuit and supported control combinations Prevents substitution based only on wattage, dimensions or pin count.
- Luminous performance
- Luminous flux in lm and efficacy in lm/W, with operating conditions and power boundary Makes output and efficiency comparisons meaningful.
- Colour characteristics
- Correlated colour temperature in K, colour rendering index and spectral distribution where available Supports selection for visual tasks and comparison with an existing installation.
- Starting and control capabilities
- Documented starting method, dimming support and switching restrictions Connects lamp operation and life expectations to the actual control system.
- Observed operating condition
- Unassessed, operating normally, slow starting, flickering, reduced output, non-starting, visibly damaged Records symptoms without prematurely attributing them to the lamp.
- Mercury content and containment
- Declared mercury mass in mg, documented mercury form and envelope integrity Supports appropriate handling and disposal using evidence specific to the lamp.
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 19 findings · 33 questions.
Fluorescent identity Establishes the light-generation mechanism and the boundary of the lamp.
Similar-looking tubes and compact bulbs can use different technologies and require different actions.
Discharge and phosphor
Records evidence that the source uses fluorescent discharge lighting.
Mechanism identification
Identify the discharge and phosphor mechanism from reliable documentation or markings, with appearance serving only as supporting evidence.
- What evidence establishes a low-pressure mercury discharge exciting a phosphor coating? definition
- Which markings or manufacturer documents distinguish this lamp from an LED replacement with the same shape? provenance
Replaceable assembly
Separates the lamp envelope and base from external gear and the luminaire.
Lamp boundary
Record which electrodes, starting components and control electronics belong to the replaceable lamp assembly.
- Does the replaceable lamp include a ballast or starter, or depend on external components? boundary
- Which identifying codes describe the lamp itself rather than the luminaire or a product family? provenance
Fit and electrical operation Connects physical interfaces with the discharge circuit required for operation.
A fluorescent lamp can fit a socket while being unsuitable for its ballast or starting circuit.
Mechanical interface
Captures the lamp geometry and contact arrangement relevant to installation.
Physical fit
Establish the base designation, contact arrangement and actual dimensions needed for the intended holder and enclosure.
- What are the base designation, pin arrangement, overall length and envelope diameter? measurement
- Does the intended luminaire accommodate the lamp's shape, insertion method and required clearances? boundary
Ballast and starting
Captures current limiting, ignition and electrode-heating requirements.
Circuit match
Determine compatibility from the documented lamp-and-gear combination rather than a shared nominal wattage.
- Which ballast ratings, starting method and starter arrangement are specified for this lamp? provenance
- What lamp voltage, current and power apply under the specified operating conditions? measurement
- Does the proposed replacement have documented compatibility with the installed circuit? action
Light and control performance Records useful light output and its dependence on temperature, startup and controls.
Nominal wattage does not establish delivered light, colour quality or behaviour after switching.
Photometric and colour output
Describes emitted light using declared measurement conditions.
Rated and observed output
Keep rated output distinct from observations and distinguish lamp efficacy from system efficacy including ballast losses.
- What luminous flux, colour temperature and colour-rendering values are declared, and under what conditions? measurement
- Does the efficacy figure use lamp power or total input power including control gear? boundary
Startup and control response
Describes warm-up, environmental limits, dimming and temporal light behaviour.
Operating envelope
Associate starting reliability, output stabilisation and control response with the actual lamp, gear and environment.
- What starting-temperature limits and time to stable output are documented or measured? measurement
- Which dimming range and control interfaces are supported by this lamp-and-ballast combination? action
- What temporal light modulation is measured at the intended operating and dimming settings? measurement
Degradation and service Connects service history and symptoms to maintenance decisions.
Non-starting, flicker and low output can arise from either lamp ageing or associated equipment.
Life and use history
Records exposure and duty cycle relevant to lamp survival and lumen maintenance.
Ageing context
Interpret life claims alongside operating hours, switching patterns, starting method and the manufacturer's failure criterion.
- What rated life and lumen-maintenance claims apply, and what test cycle and end-of-life criterion support them? provenance
- What operating hours, starts and switching intervals are known for the observed lamp? measurement
Symptoms and intervention
Separates visible symptoms from established causes and justified service actions.
Fault localisation
Use envelope damage, end darkening, starting behaviour and output observations to guide diagnosis without treating any single symptom as conclusive.
- Which symptoms are observed, and do they occur during startup, steady operation or dimming? measurement
- What evidence distinguishes lamp failure from a starter, ballast, holder or supply fault? boundary
- Which inspection or replacement action is supported by the equipment instructions and the person's competence? action
Containment and applicable requirements Connects mercury containment, product evidence and local rules to permitted handling and disposition.
Fluorescent lamps require decisions that depend on envelope integrity, product class, jurisdiction and date.
Mercury and breakage
Records hazardous contents and distinguishes intact spent lamps from broken lamps.
Containment state
Record documented mercury content and current envelope integrity before choosing handling or collection procedures.
- What mercury mass and form are documented for this lamp, and by which source? provenance
- Is the envelope intact, cracked or broken, and has any material been released? measurement
- Which authoritative local procedure applies to breakage cleanup or intact-lamp collection? action
Standards and market status
Records applicable product requirements and distinguishes market restrictions from continued-use and disposal rules.
Applicability evidence
Tie standards, conformity claims and regulatory restrictions to the exact lamp category, jurisdiction and effective date.
- Which safety and performance standards apply, with issuing bodies, editions and supporting conformity evidence? provenance
- Which current rules govern placing this lamp on the market, continued use and end-of-life collection in the relevant jurisdiction? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- This entry describes the lamp kind, not a particular product or installed unit; listed varieties overlap.
- Measurements are representative of common general-lighting products, not universal limits; starting method, temperature and ballast affect performance.
- Standard editions, applicability to particular lamp types, and current regional restrictions require verification; no sources were consulted.
- Which of these check these first hold for the sense of fluorescent lamp this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Linear fluorescent lamps
- Compact fluorescent lamps with integrated ballast
- Compact fluorescent lamps with separate ballast
- Circular fluorescent lamps
- U-shaped fluorescent lamps
- Cold-cathode fluorescent lamps
- Which of these kinds and varieties hold for the sense of fluorescent lamp this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Tubular lamp size designation - T5, T8, T12 - The number expresses nominal tube diameter in eighths of an inch; it does not specify length, power or electrical compatibility.
- IEC lamp-cap designation - G5, G13 - Common bi-pin caps for linear fluorescent lamps, specified within the IEC 60061 system; matching the cap alone does not establish compatibility.
- Which of these identifiers and schemes hold for the sense of fluorescent lamp this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- IEC 60081, issued by the International Electrotechnical Commission: performance specifications for double-capped fluorescent lamps.
- IEC 60901, issued by the International Electrotechnical Commission: performance specifications for single-capped fluorescent lamps.
- IEC 61195, issued by the International Electrotechnical Commission: safety specifications for double-capped fluorescent lamps.
- IEC 61199, issued by the International Electrotechnical Commission: safety specifications for single-capped fluorescent lamps.
- IEC 61347-2-3, issued by the International Electrotechnical Commission: particular requirements for AC- and/or DC-supplied electronic controlgear for fluorescent lamps.
- Which of these standards and regulation hold for the sense of fluorescent lamp this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- General lighting in offices, schools, shops and industrial buildings.
- Residential lighting using compact fluorescent lamps.
- Backlighting in older liquid-crystal displays using cold-cathode lamps.
- Plant-growing and aquarium lighting using selected phosphor spectra.
- Ultraviolet applications using specialised fluorescent phosphors, including blacklight lamps.
- Which of these real-world use hold for the sense of fluorescent lamp this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Nominal tube diameter for T5, T8 and T12 lamps - Approximately 16, 26 and 38, respectively - mm
- Common linear general-lighting lamp length - Approximately 0.6-1.5 - m
- Rated power of common linear general-lighting lamps - Approximately 14-80 - W
- Lamp luminous efficacy, excluding ballast losses - Approximately 50-100 - lm/W
- Correlated colour temperature of common white-light lamps - Approximately 2700-6500 - K
- Which of these typical measurements hold for the sense of fluorescent lamp this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Electrode emitter depletion can cause end blackening, difficult starting, flickering and eventual failure.
- Phosphor degradation and changes within the discharge can reduce light output over time.
- Ballast or starter failure, or incompatible controlgear, can prevent starting or cause abnormal operation and overheating.
- Glass breakage creates sharp fragments and can release mercury; mercury content also makes end-of-life waste handling significant.
- Mains-powered circuitry presents electric-shock hazards; flicker can also produce stroboscopic effects around moving machinery.
- Which of these failure modes and hazards hold for the sense of fluorescent lamp this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Nominal lengths, wattage families and product naming conventions vary between markets.
- Supply voltage and frequency affect ballast selection; lamp interchangeability requires more than matching physical dimensions.
- Mercury restrictions, product phase-outs and waste-collection requirements vary by jurisdiction.
- Which of these regional variation hold for the sense of fluorescent lamp this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- LED tube - Uses semiconductor emitters rather than a mercury discharge, even when designed to replace a fluorescent tube.
- Incandescent lamp - Produces light primarily by heating a filament rather than exciting phosphor with discharge-generated ultraviolet radiation.
- High-pressure mercury-vapour lamp - Operates a mercury discharge at substantially higher pressure; a phosphor coating alone does not make it a fluorescent lamp in the conventional classification.
- Low-pressure mercury germicidal lamp - Ordinarily transmits ultraviolet radiation directly rather than converting it into visible light through a fluorescent coating.
- Fluorescent luminaire - Is the complete lighting assembly, including lamp holders, housing and associated components; the lamp is its light-producing component.
- Fluorescent-lamp ballast - Limits discharge current and may provide starting functions; it is controlgear rather than the light-producing lamp.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of fluorescent lamp this model covers, and on what evidence? provenance
What the second pass must settle
- Should this registry entry include cold-cathode fluorescent lamps and external-electrode variants, or do neighbouring entries already own those specialisations?
- Which authoritative lamp classifications, base designations and dimensional references should anchor the supported configuration categories?
- Which safety and performance standards and certification schemes apply to each included lamp configuration and control-gear arrangement?
- What sourced ranges for output, efficacy, life, temperature limits and mercury content are representative of the included lamp classes?
- Which jurisdiction and effective date should govern market restrictions, breakage guidance and collection requirements?