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G4 LED Bulbs & T3 Replacement Lamps
Shop G4 LED bulbs and compatible T3 replacement lamps for low-voltage landscape fixtures. Compare capsule, compact and wafer designs by physical fit, light distribution and output. Confirm the G4 socket, operating voltage and AC/DC requirements before choosing a replacement.
Start with T3 versus G4 identification, our G4 buying guide or halogen-to-LED replacement checklist. For other formats, browse all 12V landscape bulbs.
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How to choose G4 LED landscape bulbs
Are T3 and G4 bulbs the same?
They can describe the same lamp, but they identify different features. G4 specifies a two-pin base with nominal 4 mm pin-center spacing. T3 traditionally describes a tubular shape; modern product families may also use it as a replacement description. Neither marking establishes the operating voltage or complete LED dimensions.
Confirm the base rather than choosing by the capsule's appearance. Our T3 and G4 comparison explains which markings matter.
Capsule, compact or wafer: which fits?
An upright omnidirectional lamp distributes light around its body. A flat wafer places the LEDs differently and can suit fixtures designed for a flatter source. Compare overall length, width, pin orientation and LED position relative to the shade or reflector. The lens must close and seals must seat normally.
A matching G4 socket does not make these bodies interchangeable. Compare examples in the G4 landscape bulb buying guide. Check the exact dimensions even when a product is called micro or compact.
Can a G4 LED replace a halogen bulb?
Often yes, when the base, supply, enclosure and available space are compatible. Switch off power and allow the fixture to cool before inspection. Check the socket, lens and seals for damage. Choose LED brightness by published lumens and distribution rather than copying the old halogen wattage.
Test one bulb before converting a group of fixtures. Use our G4 halogen replacement guide for the compatibility and installation checklist.
Confirm 12V supply and dimming compatibility
G4 names the base, not a 4V requirement. For a nominal 12V landscape circuit, check the exact bulb's allowed input range and AC/DC specification. An older transformer may have a minimum load that a small LED installation does not meet. Lowering the load can also change voltage at the fixtures.
Use the lamp and transformer manufacturers' loading and control instructions. A dimmable label does not establish compatibility with every dimmer. Compare landscape transformers if the existing supply is unsuitable.
Choose output and color for the fixture
Compare lumens separately from watts, then consider how the housing directs the light. More output can create glare without improving the useful light on a path or step. Match nearby lamps' stated color temperature: 2700K generally looks more golden than 3000K.
Check enclosure and outdoor-use restrictions for the exact model. Browse path lights, deck lights or step lights only after confirming each fixture's specified light source; these collections include other lamp types and integrated LEDs.
What if the pins or socket do not match?
Do not bend pins to fit another base. GY6.35 bulbs use different pin spacing, and some models are not intended for outdoor use. T5 wedge bulbs and S8 wedge bulbs use a different connection from G4.
Use the bulb identification photo guide if the old lamp is missing or unreadable. Record the fixture model and replacement SKU, voltage, wattage and color temperature for future orders.