G Series Lamp Base — G4 G5.3 G9 G12 G13 G23 G24 G53 Bi-Pin Socket

G Series Bi-Pin Lamp Bases — G4 to G53 Sockets for Halogen, LED & CFL Bi-Pin Bulbs

The G series lamp base uses a bi-pin (two-pin) contact system where the lamp is held by two parallel pins inserted into a matching socket. The "G" designation indicates bi-pin, followed by the center-to-center distance between the two pins in millimeters. G series bases are the standard for halogen capsule lamps, low-voltage MR11/MR16 spotlights, T5/T8 fluorescent tubes, compact fluorescent lamps (CFL), and professional track lighting. This collection covers the complete G series range from the miniature G4 (4mm pin spacing) to the large G53 (53mm pin spacing).

G Series Size Reference Guide

• G4 — 4mm pin spacing. Miniature bi-pin for low-voltage (12V) halogen capsule lamps and LED replacements. Used in under-cabinet lighting, display cases, and decorative fixtures.
• G5.3 — 5.3mm pin spacing. Standard for MR16 low-voltage (12V) halogen and LED spotlight lamps. The most common bi-pin base for track lighting, recessed downlights, and retail display lighting.
• G9 — 9mm pin spacing. Mains voltage (120–240VAC) bi-pin for halogen capsule lamps. Used in wall sconces, pendant lights, and decorative fixtures without a transformer.
• G12 — 12mm pin spacing. Single-ended ceramic metal halide (CDM/CMH) lamp base for professional track lighting and retail display fixtures.
• G13 — 13mm pin spacing. Standard T8 fluorescent tube bi-pin base (also used for T10 and T12 tubes). The most common fluorescent lamp base for office, commercial, and industrial lighting.
• G23 — 23mm pin spacing. 2-pin compact fluorescent lamp (CFL) base for PL-S lamps. Used in downlights, wall packs, and emergency lighting fixtures.
• G24 — 24mm pin spacing. 4-pin compact fluorescent lamp base for PL-C and PL-T lamps (G24q-1, G24q-2, G24q-3 variants). Used in commercial downlights and troffer fixtures.
• G53 — 53mm pin spacing. AR111 (QR111) halogen and LED lamp base for professional track lighting and architectural accent lighting.

Key Technical Specifications

• Materials: Ceramic (G4, G5.3, G9, G12 — high-temperature for halogen), phenolic (G13, G23, G24 — for fluorescent/CFL), plastic (G53 — for LED AR111)
• Rated voltage: 12V DC/AC (G4, G5.3) / 250V AC (G9, G12, G13, G23, G24, G53)
• Rated current: 2A (G4/G5.3) / 4A (G9/G12) / 2A (G13/G23/G24) / 5A (G53)
• Mounting: Panel mount, wire leads, PCB mount (G4), snap-in (G13)
• Certifications: CE, RoHS

Complete Product Range in This Collection

This collection includes: G4 ceramic bi-pin bases (panel mount, wire leads, PCB mount), G5.3 ceramic MR16 bases (panel mount, wire leads), G9 ceramic mains-voltage bases (panel mount, wire leads), G12 ceramic CDM bases (panel mount), G13 phenolic T8 fluorescent bases (single-pin and bi-pin, snap-in and wire leads), G23 phenolic PL-S CFL bases, G24 phenolic PL-C/PL-T CFL bases (G24d-1/2/3 and G24q-1/2/3 variants), and G53 AR111 bases (panel mount, wire leads).

Ideal Applications

• G4: Under-cabinet lighting, display case accent lighting, decorative low-voltage fixtures, model and miniature lighting
• G5.3: MR16 track lighting, recessed downlights, retail display spotlights, landscape lighting transformers
• G9: Wall sconces, pendant lights, decorative table lamps, mains-voltage halogen and LED capsule fixtures
• G12: Professional retail track lighting (CDM/CMH lamps), museum and gallery accent lighting
• G13: T8 fluorescent tube fixtures for offices, warehouses, and commercial spaces; LED T8 tube retrofit sockets
• G23/G24: Compact fluorescent downlights, wall packs, emergency lighting, commercial troffer fixtures
• G53: AR111 track lighting, architectural accent lighting, high-CRI retail display fixtures

G Series Lamp Base Buying Guide

Step 1 — Identify pin spacing: Measure the center-to-center distance between the two pins on your existing lamp. This measurement in millimeters is the G number (e.g., 5.3mm = G5.3, 9mm = G9).

Step 2 — Verify voltage: G4 and G5.3 are low-voltage (12V) bases requiring a transformer or LED driver. G9, G12, G13, G23, G24, and G53 are mains-voltage (120–240VAC) bases. Never connect a 12V lamp to a mains-voltage socket.

Step 3 — Choose material: Ceramic bases are required for halogen lamps (G4, G5.3, G9, G12) due to high operating temperatures. Phenolic bases are suitable for fluorescent and CFL lamps (G13, G23, G24). For LED replacements, phenolic or plastic bases are sufficient.

Step 4 — G24 variant (d vs q): G24d bases have 2 pins and are for non-dimmable CFL lamps with integrated ballast. G24q bases have 4 pins and are for CFL lamps requiring an external ballast. Verify your fixture's ballast type before ordering.

Why Choose Yoeruyo for G Series Lamp Bases?

Yoeruyo stocks the complete G series bi-pin lamp base range — from G4 miniature to G53 AR111 — in ceramic, phenolic, and plastic materials with multiple mounting configurations. All products are CE and RoHS certified. Available from 10pcs for repair to 500pcs+ for OEM luminaire manufacturing.

Frequently Asked Questions

Q: What is the difference between G5.3 and GU5.3?
A: G5.3 and GU5.3 both have 5.3mm pin spacing and are used for MR16 lamps. GU5.3 has a locking collar (the "U" indicates a twist-lock feature) that prevents the lamp from being pulled out accidentally. Most modern MR16 fixtures use GU5.3 sockets; G5.3 is the older non-locking version. Both accept the same MR16 lamps.

Q: Can I use a G9 socket for LED capsule lamps?
A: Yes. G9 LED capsule lamps are direct replacements for G9 halogen lamps and use the same G9 socket. Ensure the LED lamp is rated for your mains voltage (120V or 240VAC).

Q: What is the difference between G13 single-pin and bi-pin?
A: G13 bi-pin bases have two contacts per end (standard for T8 fluorescent tubes). G13 single-pin (also called FA8) has one contact per end (used for T8 single-pin LED tubes). Verify your tube type before ordering the socket.

Q: Are G24d and G24q sockets interchangeable?
A: No. G24d (2-pin) and G24q (4-pin) are different socket types for different CFL lamp configurations. G24d is for lamps with integrated ballast; G24q is for lamps requiring an external ballast. They are not physically interchangeable.

Q: What lamp does a G53 base accept?
A: G53 accepts AR111 (also called QR111 or ES111) lamps — large-diameter (111mm) reflector lamps used in professional track lighting and architectural accent fixtures. Available in halogen and LED versions.