Home > Products > Low-Voltage LED Bulbs > G4 LED Bulb 2.5W 250LM | 20W Halogen Equiv 12V 24V 48V
G4 bi-pin LED replacement bulb 2.5W 250LM studio product photography showcase
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G4 bi-pin LED bulb with 39 SMD 3014 chips and aviation aluminum base front perspective
G4 miniature LED replacement lamp horizontal view showing cylindrical aluminum body
G4 LED bulb top angle close-up displaying 39 SMD 3014 radial array and aluminum core
G4 bi-pin base terminal pins 4mm pitch standard connection studio photography
G4 LED bulb standing vertical perspective highlighting 14.5mm compact diameter
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Cross Reference / Direct Replacement
G4 Bi-Pin Base (4mm Pitch)
JC Type Halogen 10W Equivalent
JC Type Halogen 20W Equivalent
JC Type Halogen 25W Equivalent
G4 12V Miniature Bi-Pin
G4 24V Commercial Bi-Pin

G4 LED Bulb 2.5W 250LM (20W-25W Halogen Equiv) - 360° Omnidirectional (12V / 24V / 48V)

B2B factory G4 bi-pin LED bulb (2.5W, 250LM) engineered to replace 20W-25W JC halogen bulbs. Features 39x SMD 3014 emitters with 360-degree radial beam, aviation aluminum thermal base, and discrete voltage options (12V, 24V, 48V) for marine cabin, RV interior, puck light, and low-voltage landscape lighting.
Product Model: G4-39L
Socket / Base: G4 Bi-Pin (4mm Pin Spacing, Straight Terminal)
Bulb Dimensions: Φ14.5mm × 34mm Total Length (Pin Length ~10mm)
Operating Voltage: 3.7VDC / 6-15VDC / 10-30VDC / 48VDC (Custom 24V PWM Dimmable Available)
Power Consumption: 2.5W (High-Efficiency 20W-25W Halogen Retrofit)
Luminous Flux: 250 LM (Pure Uniform 360° Omnidirectional Beam)
Color Temperature: 6500K Xenon White / 3000K Warm White / 4500K Neutral White
LED Emitters: 39× High-Efficiency SMD 3014 LEDs (Ra ≥ 80, 360° Cylindrical Emitting)
Enclosure / Body: Precision Machined Aluminum Heat-Sink Core + Protective Optical Coating
Primary Uses: Marine Cabin & Reading Lights, RV Interior, Under-Cabinet Puck Lights, Landscape Fixtures
Quality & Warranty: CE (EMC Compliant), RoHS | 2 Years Factory Warranty
Factory B2B Terms: Standard: from 5 pairs | Custom Packaging: Packaging run MOQ 5,000 pcs (pre-funded and drawn down across repeat orders)
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  • Product Details

Engineering Architecture & Thermal Management

The G4-39L bi-pin LED retrofit bulb is engineered specifically for low-voltage, continuous-duty lighting installations requiring maximum lumen maintenance and tight dimensional compliance. Featuring a high-density matrix of 39 radially mounted SMD 3014 emitters arrayed across a precision-turned aluminum core, the bulb delivers a true 360-degree cylindrical light emission without the dark cones or harsh directional shadows common in flat planar LED discs.

Its CNC-machined aviation aluminum core provides low thermal impedance, rapidly sinking heat away from the LED diode junctions into the surrounding fixture housing. This active thermal conductive pathway prevents lumen depreciation and ensures an operational lifespan exceeding 30,000 hours, even when operating in compact, enclosed marine ceiling pucks or unventilated under-cabinet fixtures.

Electrical Reliability & Discrete Voltage Architecture

Unlike consumer-grade G4 bulbs that rely on basic resistive droppers susceptible to thermal runaway during battery charging cycles, our commercial-grade G4 series incorporates discrete voltage options engineered for industrial battery banks and fluctuating DC distribution networks:

  • Marine & RV DC 12V / 24V Systems: Integrated constant-current IC circuitry buffers against engine alternator spikes (up to 15V on 12V lines and 30V on 24V lines) without flickering or premature driver degradation.
  • Industrial & Telecom 48V DC Systems: Dedicated 48VDC configuration accommodates telecommunication battery rooms, solar off-grid storage banks, and central battery emergency circuits.
  • Optional PWM Dimming: Specialized 24V dimming-compatible circuit enables stepless duty-cycle illumination control for architectural lighting and luxury yacht interior scenes.

Dimensional Compatibility & Drop-in Retrofit

With an outer diameter of only 14.5mm and a compact 34mm overall length, the G4-39L bulb replicates the dimensional clearance of traditional 20W JC-type halogen capsules. The rigid standard 4mm-pitch bi-pin terminals fit securely into all spring-tensioned G4 sockets without loose contact or thermal deformation.

Frequently Asked Questions

Can the G4-39L LED bulb directly replace 20W and 25W JC halogen bulbs in enclosed under-cabinet and marine fixtures?
Yes. The G4-39L has a compact profile of Φ14.5mm × 34mm, allowing it to fit into standard G4 puck lights, reading lamps, and enclosed marine ceiling fixtures. Its 39x SMD 3014 array produces 250 lumens of omnidirectional light equivalent to a 20W-25W halogen, while consuming only 2.5W and generating significantly less operating heat, eliminating scorched lens covers and damaged wiring sockets.
What is the pin spacing and how do I verify socket compatibility?
The G4 base features straight dual contact pins spaced exactly 4mm apart (center-to-center). It is engineered for standard G4 sockets. It is not interchangeable with larger bi-pin bases such as G6.35 (6.35mm pitch) or GU5.3 (5.3mm pitch). Always measure your socket pin pitch before specifying batch replacement.
Which DC operating voltage version should be specified for our project?
We offer discrete voltage versions matched to commercial electrical systems: 10-30VDC wide-voltage version for 12V and 24V marine vessels, recreational vehicles, and low-voltage landscape transformers; a dedicated 48VDC version for telecommunication base station battery rooms, DC microgrids, and solar energy storage systems; as well as specialized 3.7V / 6-15V variants or 24V PWM dimmable drivers upon request.
What is the factory minimum order quantity (MOQ) and custom packaging policy?
For standard inventory specifications, our MOQ starts from 5 pairs for evaluation and distributor sample verification. For customized commercial blister packs, printed gift boxes, or client OEM branding, the packaging printing MOQ is 5,000 units. The client pre-funds the custom packaging inventory, which is warehoused in our Dongguan factory and drawn down across rolling production orders.