# BulbMatch

> BulbMatch is an independent English-language reference for identifying household light bulbs and checking replacement specifications. It does not sell products or publish prices.

Last reviewed: 2026-08-26

**Interpretation.** A matching base confirms only the socket connection. Voltage, actual wattage, lumens, dimensions, dimming, enclosure, heat, vibration, location ratings, and fixture limits remain separate checks. Product pages are normalized official records, not offers or endorsements. Unknown or conflicting fields are left unstated or held from publication instead of being inferred.

**Citation preference.** Cite the most specific base, fixture, guide, or model page and preserve its limitations. For standards, safety, or model-specific claims, follow the primary sources linked on that page. A configured or monitored source is not the same as a verified model record; the data-source page documents that distinction.

## Start here
- [Find my bulb](https://getbulbmatch.com/find-my-bulb/): Build a replacement brief from the old bulb and fixture
- [Smart bulb compatibility](https://getbulbmatch.com/smart-bulbs/): Separate Matter, Thread, Wi-Fi, controllers, Border Routers, and physical fixture fit
- [Base profiles](https://getbulbmatch.com/bases/): Identification guides for common socket connections
- [Bulb shapes](https://getbulbmatch.com/shapes/): Nominal envelope diameters, common uses, and shape-specific cautions
- [LED replacement matrix](https://getbulbmatch.com/led-replacement/): Direct, conditional, wiring-specific, and stop-condition replacement paths
- [Free bulb tools](https://getbulbmatch.com/tools/): Interactive and printable identification references
- [Beam spread calculator](https://getbulbmatch.com/beam-spread-calculator/): Estimate circular beam diameter and area from the exact lamp angle and distance
- [Printable bulb label decoder](https://getbulbmatch.com/printable-bulb-label-guide/): Original field sheet separating shape, base, electrical, light-output, control, rating, and model fields
- [Printable base measuring guide](https://getbulbmatch.com/printable-bulb-measurement/): Original metric screw-base comparison chart with calibration check
- [Fixture guides](https://getbulbmatch.com/fixtures/): Fixture-specific heat, vibration, and clearance checks
- [Bulb articles](https://getbulbmatch.com/articles/): Sourced answers to common replacement questions
- [Verified model records](https://getbulbmatch.com/products/): Normalized official manufacturer records; not offers
- [Sources and method](https://getbulbmatch.com/sources/): Primary-source policy and interpretation limits
- [Full data-source status](https://getbulbmatch.com/data-sources/): Coverage, freshness, and publication boundaries
- [Editorial policy and team](https://getbulbmatch.com/editorial-policy/): Authorship, corrections, and review standards
- [BulbMatch full context](https://getbulbmatch.com/llms-full.txt): Consolidated base profiles and editorial guides

## Base profiles
- [E12 base — Candelabra screw](https://getbulbmatch.com/bases/e12/): E12 is the small screw base commonly used in decorative U.S. fixtures. The 12 refers to the approximate thread diameter in millimeters.
- [E14 base — Small Edison screw](https://getbulbmatch.com/bases/e14/): E14 is a small Edison screw base with a nominal 14 mm thread diameter. It is larger than E12, and the base code alone does not identify voltage.
- [E17 base — Intermediate screw](https://getbulbmatch.com/bases/e17/): E17 sits between candelabra E12 and standard E26. It is common in compact appliance fixtures where a full-size bulb would not fit.
- [E26 base — Medium screw](https://getbulbmatch.com/bases/e26/): E26 is a medium Edison screw base with a nominal 26 mm thread diameter. In the United States, “standard” or “medium” base commonly means E26; bulb shape and voltage are separate specifications.
- [E27 base — European medium screw](https://getbulbmatch.com/bases/e27/): E27 is the common medium screw base in many 220–240 V markets. It looks almost identical to U.S. E26, so voltage and fixture certification matter.
- [GU10 base — Twist-and-lock](https://getbulbmatch.com/bases/gu10/): A GU10 bulb has two short pins with widened ends spaced a nominal 10 mm apart. It pushes in and twists to lock, but GU10 does not define one overall diameter, length, voltage, or beam angle.
- [GU24 base — Two-pin twist lock](https://getbulbmatch.com/bases/gu24/): GU24 has two pins set 24 mm apart and locks with a twist. It was designed to prevent the use of inefficient screw-in lamps in dedicated fixtures.
- [G4 base — Straight bi-pin](https://getbulbmatch.com/bases/g4/): A G4 bulb base has two thin straight pins with nominal 4 mm center-to-center spacing. G4 identifies the connection only; it does not specify voltage, AC or DC supply, capsule size, or transformer compatibility.
- [G9 base — Looped bi-pin](https://getbulbmatch.com/bases/g9/): A G9 bulb base has two U-shaped wire loops with nominal 9 mm center-to-center spacing. It pushes straight into the socket; voltage and capsule dimensions must be checked separately.
- [E11 base — Mini-candelabra screw](https://getbulbmatch.com/bases/e11/): E11 is an 11 mm Edison screw base. It is smaller than E12 and is not interchangeable with a candelabra socket.
- [B22d base — Double-contact bayonet](https://getbulbmatch.com/bases/b22d/): B22d is a 22 mm bayonet cap with two side pins and two electrical contacts. Push in and rotate to lock.
- [GU5.3 base — Straight bi-pin reflector base](https://getbulbmatch.com/bases/gu53/): GU5.3 uses two straight pins spaced a nominal 5.3 mm apart. It is commonly paired with MR16 reflectors but does not itself define voltage or beam angle.
- [G8 base — Straight bi-pin](https://getbulbmatch.com/bases/g8/): G8 has two straight pins with nominal 8 mm center spacing. Pin spacing, voltage, capsule width, and fixture clearance all need to match.
- [R7s base — Double-ended recessed contact](https://getbulbmatch.com/bases/r7s/): R7s identifies a double-ended linear lamp contact system. The exact overall length—commonly around 78 or 118 mm—must be matched separately.
- [G13 base — Medium bi-pin tube base](https://getbulbmatch.com/bases/g13/): G13 is the two-pin base used at the ends of many T8 and T12 linear lamps. A matching base does not establish ballast or wiring compatibility.
- [E39 base — Mogul screw](https://getbulbmatch.com/bases/e39/): E39 is a large mogul Edison screw base with a nominal 39 mm diameter. It is physically and electrically distinct from household E26.
- [B15d base — Small double-contact bayonet](https://getbulbmatch.com/bases/b15d/): B15d is a small 15 mm bayonet cap with two side pins and two bottom contacts. It is smaller than B22d.
- [G5 base — Miniature bi-pin tube base](https://getbulbmatch.com/bases/g5/): G5 is the miniature two-pin base used at each end of many T5 linear lamps. It does not identify ballast or LED wiring compatibility.
- [GU4 base — 4 mm bi-pin reflector base](https://getbulbmatch.com/bases/gu4/): GU4 uses two straight pins spaced a nominal 4 mm apart and is commonly paired with MR11 reflectors.
- [GY6.35 base — 6.35 mm bi-pin](https://getbulbmatch.com/bases/gy635/): GY6.35 is a straight bi-pin cap with nominal 6.35 mm pin spacing. Capsule size, pin diameter, voltage, and wattage still need to match.
- [G23 base — Two-pin plug-in CFL base](https://getbulbmatch.com/bases/g23/): G23 is a keyed two-pin plug-in lamp base. Wattage keying and ballast compatibility matter in addition to the visible pin arrangement.
- [GX23 base — Two-pin keyed CFL base](https://getbulbmatch.com/bases/gx23/): GX23 is a keyed two-pin plug-in base used by compact fluorescent and some LED retrofit lamps. Keying and ballast type must match.
- [2G7 base — Four-pin single-ended CFL base](https://getbulbmatch.com/bases/2g7/): 2G7 is a four-pin, single-ended plug-in base. The complete lamp designation and control gear determine compatibility.
- [2G11 base — Four-pin long CFL base](https://getbulbmatch.com/bases/2g11/): 2G11 is a four-pin base used on long compact fluorescent lamps and some LED replacements. Length and control gear must match.
- [GX24q base — Four-pin keyed CFL base family](https://getbulbmatch.com/bases/gx24q/): GX24q is a four-pin keyed plug-in family. The suffix, such as GX24q-1 or GX24q-3, is part of the compatibility check.

## Bulb shape profiles
- [A15 shape — compact A-shape bulb](https://getbulbmatch.com/shapes/a15/): A15 is the compact a-shape bulb designation. Its nominal maximum diameter is 1.875 inches. Confirm overall length inside a globe or cover. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [A19 shape — standard A-shape bulb](https://getbulbmatch.com/shapes/a19/): A19 is the standard a-shape bulb designation. Its nominal maximum diameter is 2.375 inches. An E26 base can carry many shapes besides A19. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [A21 shape — large A-shape bulb](https://getbulbmatch.com/shapes/a21/): A21 is the large a-shape bulb designation. Its nominal maximum diameter is 2.625 inches. A21 may not clear a shade sized for A19. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [A25 shape — extra-large A-shape bulb](https://getbulbmatch.com/shapes/a25/): A25 is the extra-large a-shape bulb designation. Its nominal maximum diameter is 3.125 inches. Base and overall length vary by product. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [B10 shape — blunt-tip decorative bulb](https://getbulbmatch.com/shapes/b10/): B10 is the blunt-tip decorative bulb designation. Its nominal maximum diameter is 1.25 inches. B10 is a shape, not a candelabra-base code. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [B11 shape — large blunt-tip decorative bulb](https://getbulbmatch.com/shapes/b11/): B11 is the large blunt-tip decorative bulb designation. Its nominal maximum diameter is 1.375 inches. B11 is wider than B10. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [C7 shape — small cone-shaped bulb](https://getbulbmatch.com/shapes/c7/): C7 is the small cone-shaped bulb designation. Its nominal maximum diameter is 0.875 inches. String-light voltage may differ from household voltage. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [C9 shape — cone-shaped decorative bulb](https://getbulbmatch.com/shapes/c9/): C9 is the cone-shaped decorative bulb designation. Its nominal maximum diameter is 1.125 inches. Check the string or socket voltage. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [CA10 shape — bent-tip candle bulb](https://getbulbmatch.com/shapes/ca10/): CA10 is the bent-tip candle bulb designation. Its nominal maximum diameter is 1.25 inches. The bent tip changes appearance and overall length, not base compatibility. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [G16.5 shape — small globe bulb](https://getbulbmatch.com/shapes/g16-5/): G16.5 is the small globe bulb designation. Its nominal maximum diameter is 2.0625 inches. The decimal is still measured in eighths of an inch. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [G25 shape — medium globe bulb](https://getbulbmatch.com/shapes/g25/): G25 is the medium globe bulb designation. Its nominal maximum diameter is 3.125 inches. Globe diameter may obstruct closely spaced sockets. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [G30 shape — large globe bulb](https://getbulbmatch.com/shapes/g30/): G30 is the large globe bulb designation. Its nominal maximum diameter is 3.75 inches. Measure fixture spacing before replacing smaller globes. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [G40 shape — extra-large globe bulb](https://getbulbmatch.com/shapes/g40/): G40 is the extra-large globe bulb designation. Its nominal maximum diameter is 5 inches. Five-inch globes need substantial clearance. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [BR20 shape — small bulged-reflector bulb](https://getbulbmatch.com/shapes/br20/): BR20 is the small bulged-reflector bulb designation. Its nominal maximum diameter is 2.5 inches. Beam spread and neck length vary. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [BR30 shape — bulged-reflector flood bulb](https://getbulbmatch.com/shapes/br30/): BR30 is the bulged-reflector flood bulb designation. Its nominal maximum diameter is 3.75 inches. BR30 and PAR30 share nominal diameter but distribute light differently. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [BR40 shape — large bulged-reflector flood bulb](https://getbulbmatch.com/shapes/br40/): BR40 is the large bulged-reflector flood bulb designation. Its nominal maximum diameter is 5 inches. BR40 may not fit a can designed for BR30. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [PAR16 shape — small PAR reflector bulb](https://getbulbmatch.com/shapes/par16/): PAR16 is the small par reflector bulb designation. Its nominal maximum diameter is 2 inches. PAR16 does not determine the base. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [PAR20 shape — PAR reflector bulb](https://getbulbmatch.com/shapes/par20/): PAR20 is the par reflector bulb designation. Its nominal maximum diameter is 2.5 inches. Match beam angle as well as diameter. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [PAR30 shape — medium PAR reflector bulb](https://getbulbmatch.com/shapes/par30/): PAR30 is the medium par reflector bulb designation. Its nominal maximum diameter is 3.75 inches. Short-neck and long-neck versions are not dimensionally identical. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [PAR38 shape — large PAR reflector bulb](https://getbulbmatch.com/shapes/par38/): PAR38 is the large par reflector bulb designation. Its nominal maximum diameter is 4.75 inches. Verify wet-location rating for exposed outdoor fixtures. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [MR11 shape — small multifaceted-reflector bulb](https://getbulbmatch.com/shapes/mr11/): MR11 is the small multifaceted-reflector bulb designation. Its nominal maximum diameter is 1.375 inches. MR11 describes the reflector, not the base or voltage. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [MR16 shape — multifaceted-reflector bulb](https://getbulbmatch.com/shapes/mr16/): MR16 is the multifaceted-reflector bulb designation. Its nominal maximum diameter is 2 inches. MR16 lamps may use different bases and voltages. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [R20 shape — small reflector bulb](https://getbulbmatch.com/shapes/r20/): R20 is the small reflector bulb designation. Its nominal maximum diameter is 2.5 inches. R and BR optics are not identical. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [R30 shape — medium reflector bulb](https://getbulbmatch.com/shapes/r30/): R30 is the medium reflector bulb designation. Its nominal maximum diameter is 3.75 inches. Check whether the fixture originally specifies R, BR, or PAR. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [R40 shape — large reflector bulb](https://getbulbmatch.com/shapes/r40/): R40 is the large reflector bulb designation. Its nominal maximum diameter is 5 inches. Do not assume a general LED is suitable for heat-lamp service. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [S14 shape — sign bulb](https://getbulbmatch.com/shapes/s14/): S14 is the sign bulb designation. Its nominal maximum diameter is 1.75 inches. String voltage and socket base vary. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [ST19 shape — straight-sided Edison-style bulb](https://getbulbmatch.com/shapes/st19/): ST19 is the straight-sided edison-style bulb designation. Its nominal maximum diameter is 2.375 inches. ST19 identifies shape, not filament type or base. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [T4 shape — narrow tubular bulb](https://getbulbmatch.com/shapes/t4/): T4 is the narrow tubular bulb designation. Its nominal maximum diameter is 0.5 inches. T4 products use several unrelated bases and voltages. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [T5 shape — tubular lamp](https://getbulbmatch.com/shapes/t5/): T5 is the tubular lamp designation. Its nominal maximum diameter is 0.625 inches. T5 can refer to linear fluorescent/LED tubes or small incandescent envelopes. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [T8 shape — one-inch tubular lamp](https://getbulbmatch.com/shapes/t8/): T8 is the one-inch tubular lamp designation. Its nominal maximum diameter is 1 inches. A G13 base does not prove ballast compatibility. The base, voltage, light output, and exact overall length come from the individual lamp specification.
- [T10 shape — wide tubular lamp](https://getbulbmatch.com/shapes/t10/): T10 is the wide tubular lamp designation. Its nominal maximum diameter is 1.25 inches. T10 products include different lamp technologies and bases. The base, voltage, light output, and exact overall length come from the individual lamp specification.

## Editorial guides
- [Replacing a G9 halogen capsule with LED](https://getbulbmatch.com/articles/replace-g9-halogen-with-led/index.md): You can often replace a G9 halogen bulb with LED, but first match voltage, lumens, dimensions, dimming, enclosure rating and fixture requirements.
- [GU10 beam angles from 15° spot to 60° flood](https://getbulbmatch.com/articles/gu10-beam-angle-guide/index.md): Compare 15°, 25°, 36°, 40°, and 60° GU10 beam angles, estimate the pool of light at a given distance, and choose spot or flood coverage.
- [E12 bulbs: base size and replacement details](https://getbulbmatch.com/articles/e12-bulb-base-size-replacement/index.md): An E12 bulb uses a nominal 12 mm candelabra screw base. Learn how to check shape, dimensions, voltage, lumens, dimming, and fixture ratings.
- [A19 vs E26: shape and base are different specifications](https://getbulbmatch.com/articles/a19-vs-e26-light-bulbs/index.md): A19 identifies a bulb shape; E26 identifies its screw base. Learn what each code means and what else to verify before replacing a bulb.
- [G4 LED replacement: voltage, transformer, fit](https://getbulbmatch.com/articles/g4-bulb-base-size-voltage-replacement/index.md): Replacing a G4 bulb? Match 4 mm straight pins, voltage and AC or DC marking, then verify transformer compatibility, dimensions, lumens, and fixture ratings.
- [G9 bulb voltage, dimensions, and fixture checks](https://getbulbmatch.com/articles/g9-bulb-base-size-voltage-replacement/index.md): Replacing a G9 bulb? Confirm 9 mm loop pins, then match voltage, capsule dimensions, lumens, dimming, enclosure, and fixture ratings.
- [GU10 replacement: voltage, size, beam angle](https://getbulbmatch.com/articles/gu10-bulb-size-voltage-replacement/index.md): Replacing a GU10 bulb? Confirm the 10 mm twist-lock base, then match voltage, MR16 or PAR16 shape, dimensions, beam angle, dimming, and fixture ratings.
- [GU10 vs GU5.3 MR16: look at the pins and voltage](https://getbulbmatch.com/articles/gu10-vs-gu53-mr16-bulbs/index.md): Compare GU10 and GU5.3 MR16 bulbs by pin style, voltage, transformer needs, beam angle, dimensions, dimming, and fixture compatibility.
- [A15 LED bulbs: size, bases, and fixture clearance](https://getbulbmatch.com/articles/a15-led-bulb-guide/index.md): An A15 bulb is nominally 1 7/8 inches wide. Learn how to check its base, voltage, lumens, dimming, enclosure, and location ratings before replacement.
- [E12 vs E14: a two-millimeter difference that matters](https://getbulbmatch.com/articles/e12-vs-e14-light-bulbs/index.md): Compare E12 and E14 light bulb bases by screw diameter, voltage context, fixture fit, and the checks to make before choosing a replacement.
- [G4 vs G9 bulbs: straight pins or wire loops](https://getbulbmatch.com/articles/g4-vs-g9-light-bulbs/index.md): Learn how G4 and G9 bulb bases differ in pin spacing, voltage, shape, and fit, plus the checks to make before installing a replacement.
- [When an LED bulb can be used in a refrigerator](https://getbulbmatch.com/articles/can-you-use-led-bulb-in-refrigerator/index.md): A regular LED may fit a refrigerator socket but still be the wrong bulb. Learn when an appliance LED is safe and when the light needs service.
- [Why a regular LED bulb does not belong in an oven](https://getbulbmatch.com/articles/can-you-use-led-bulb-in-oven/index.md): Most ovens need a model-specified appliance or halogen bulb. Learn when an LED is acceptable and how to replace an oven light safely.
- [A19 vs A21 bulbs: where the extra width matters](https://getbulbmatch.com/articles/a19-vs-a21-led-bulbs/index.md): A19 vs A21: A21 is nominally 0.25 inch wider. Compare actual length, lumens, base, voltage, dimming, enclosure rating, and fixture clearance.
- [BR30, PAR30, and PAR38: size is not the beam](https://getbulbmatch.com/articles/br30-par30-par38-shape-beam-angle/index.md): Learn how BR30, PAR30, and PAR38 size and beam angle affect coverage, intensity, fixture fit, dimming, and outdoor use.
- [Dimmable vs non-dimmable A19 LEDs](https://getbulbmatch.com/articles/dimmable-vs-non-dimmable-a19-led/index.md): Use a dimmable A19 LED on a dimmer-controlled circuit and either type on a plain switch—after checking base, voltage, fixture ratings and compatibility.
- [E26 vs GU24: two bases found on A-shape bulbs](https://getbulbmatch.com/articles/e26-vs-gu24-a-shape-bulbs/index.md): Learn why E26 and GU24 A-shape bulbs can match in lumens yet use different sockets, and how to check fit, voltage, dimming, and ratings.
- [ST19 on a light bulb: shape, size, and what it leaves out](https://getbulbmatch.com/articles/st19-edison-bulb-meaning/index.md): ST19 means a straight-tubular Edison-style bulb with a nominal 2 3/8-inch diameter. It does not identify the base, voltage, brightness, or fit.
- [2700K, 3000K, or 5000K: choosing a light color](https://getbulbmatch.com/articles/2700k-vs-3000k-vs-5000k/index.md): Compare 2700K, 3000K, and 5000K bulbs by room, appearance, evening use, and fixture fit so you can choose the right light color.
- [How many watts an A19 LED actually uses](https://getbulbmatch.com/articles/a19-led-bulb-watts/index.md): See how many watts A19 LEDs use for 40W, 60W, 75W, and 100W replacements, with lumen targets and fixture-fit checks.
- [LED bulbs in enclosed fixtures: read the rating first](https://getbulbmatch.com/articles/led-bulb-enclosed-fixture/index.md): Yes—if the LED is rated for enclosed fixtures and matches the fixture’s base, voltage, wattage, controls, and available clearance.
- [How to read the letters and numbers on a light bulb](https://getbulbmatch.com/articles/light-bulb-letters-numbers/index.md): Decode A19, E26, watts, lumens, volts, Kelvin, CRI, dimming, and enclosure markings before choosing a replacement bulb.
- [Why LED bulbs flicker and how to narrow down the cause](https://getbulbmatch.com/articles/why-led-light-bulbs-flicker/index.md): Learn why LED bulbs flicker and use a safe, step-by-step process to separate bulb, dimmer, fixture, wiring, and utility causes.

## Recent guides
- [ST19 on a light bulb: shape, size, and what it leaves out (updated 2026-08-26)](https://getbulbmatch.com/articles/st19-edison-bulb-meaning/index.md): ST19 is a bulb-shape code. ST means straight tubular, and 19 is the nominal diameter in eighths of an inch: 19/8, or about 2 3/8 inches. ST19 does not identify the base, voltage, wattage, lumens, or total length, so those fields still need to match the fixture.
- [Dimmable vs non-dimmable A19 LEDs (updated 2026-08-26)](https://getbulbmatch.com/articles/dimmable-vs-non-dimmable-a19-led/index.md): Use a dimmable A19 LED when a conventional dimmer controls the circuit. On a plain on/off switch, either a dimmable or non-dimmable model can work if its base, voltage, actual wattage, dimensions, and fixture ratings match. A dimmable label does not guarantee compatibility with every dimmer.
- [G9 bulb voltage, dimensions, and fixture checks (updated 2026-08-26)](https://getbulbmatch.com/articles/g9-bulb-base-size-voltage-replacement/index.md): A G9 bulb has two U-shaped wire loops with nominal 9 mm center-to-center spacing. It pushes straight into a matching socket. G9 identifies only the base: match the old lamp's voltage, lumens, actual wattage and dimensions, then verify dimming and enclosure ratings before replacing it.
- [Replacing a G9 halogen capsule with LED (updated 2026-08-26)](https://getbulbmatch.com/articles/replace-g9-halogen-with-led/index.md): Yes, a G9 halogen can often be replaced with a G9 LED when the LED matches the fixture voltage, provides the needed lumens, fits inside the shade, stays within the fixture's actual-watt limit, and has the required dimming, enclosure, and location ratings. The G9 base alone does not prove compatibility.
- [GU10 beam angles from 15° spot to 60° flood (updated 2026-08-25)](https://getbulbmatch.com/articles/gu10-beam-angle-guide/index.md): There is no single GU10 beam angle. Current official GU10 product records include narrow 15° and 25° spots, general-purpose 36° and 40° beams, and wide 60° floods. At the same distance, a narrower angle makes a smaller, more concentrated pool of light; a wider angle covers more area. Match the old lamp when preserving an existing effect, or choose from the target size and mounting distance.

## Knowledge graph anchors
- [Organization](https://getbulbmatch.com/#organization): BulbMatch publisher entity
- [WebSite](https://getbulbmatch.com/#website): BulbMatch website entity
- [Editorial team (Organization)](https://getbulbmatch.com/editorial-policy/#editorial-team): Named editorial desk entity
- [XML sitemap](https://getbulbmatch.com/sitemap.xml): Canonical indexable pages
- [RSS feed](https://getbulbmatch.com/feed.xml): Recently published guides