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Luxe Prestige Chronicle

What are the light bulbs called with 2 prongs? check this out | two prong light bulbs

Author

Emily Wong

Updated on July 15, 2026

Among these are 2 prong light bulbs (also known as bi-pin connectors) and 4 prong light bulbs, along with some other variants. Common forms of lighting with prongs for bases include certain fluorescent lights such as CFLs.

What are the two types of light bulb fittings?

Different light bulb fittings at a glance
E27 bulb. E27 is probably one of the most common and used bulb in lamps and it is sometimes referred to as Edison large screw. E14 bulb. GU10 bulb. GU5. G4 Bulb. G9 Bulbs. GX53 Bulbs. G53 Bulbs.

What are 2 way light bulbs?

A two way switch runs a three way lightbulb. It splits the hot wire into two circuits at the switch. They head to the socket and base of the bulb which have both been designed to have two circuits, not just one. The bulb is wired with two separate lamp filaments.

What is the difference between GU10 and GU24?

Google says: The difference lies in the distance between the pins of the bayonet connector (here it is a ‘twist and lock’ type). In a GU10 based bulb the distance between the pins is 10mm whereas in GU24 the distance between the pins is 24mm. There are adapters available to plug a GU10 based bulb to a GU24 socket.

Can I replace GU24 CFL with LED?

GU24 base lamps are the future of energy-efficient lighting

It eliminates inappropriate incandescent lamp (bulb) replacement but allows replacement with ANY wattage of CFL OR LED.

Why do some light bulbs have two prongs?

Apparently GU24 bulbs are fairly common in commercial construction and were used a lot during the switchover from incandescent bulbs to more efficient CFLs. Requiring the use of two-pin bulbs was one way to ensure people stopped using cheaper, screw-in incandescent bulbs… by making it basically impossible.

What is a GU24 light bulb base?

Available in both CFL and LED, these bulbs have a different base than the standard screw base bulbs. GU24 bulbs have 2 pins protruding from the base instead of the usual screw in base. GU24 bulbs are self ballasted i.e. the ballast portion of the bulb is already attached to the bulb and is easy to replace.

What is a BC light fitting?

BC (bayonet cap) light bulbs

Bayonet cap bulbs use a twist and lock action to secure into the fitting. They are used in a variety of lighting around the home and one of the most common types of fittings. The most common code is for bayonet caps is B22.

How do I know what bulb base I have?

To know the base of a light bulb, identify if it is a screw type that has threads around the base, or a pin type that has 2 points of contact on the base. After that, measure the diameter of the screw base, or the distance between the two pins, in millimeters.

Is Es bulb same as E27?

Often referred to by it’s abbreviation of “ES”, it’s also known as “E27”, with the E representing Edison and the 27 representing the diameter of the bulb cap in millimeters. ES GLS (General Lamp Service) bulbs are quite commonly found in many light fittings, especially outdoor lights, flush fittings and table lamps.

Can I use a 3 way bulb in a 2 way lamp?

It will work, but only at one brightness. 3 way sockets need 3 way bulbs to get the different brightness levels. If you look at the base of the bulb, there are not two, but three connections, one in the center of the bottom, another ring around that, then the threaded portion.

Will GU24 fit GU35?

can a maxlite GU24 replace a maxlite GU35 bulb ? Answer: The base on the GU35 is slightly different. I used the GU24 as a replacement in a panasonic vent fan but I had to unclip the sides of the little box that housed the bulb in order for it to fit.

Can you use GU10 in GU24?

GU10 to GU24 Bulb Adapter – Use This Adapter to Plug an GU10 (Bayonet Mount) Based Bulb Into a GU24 (Bayonet Mount) Based Light Fixture. The GU24 socket and base system was designed to replace the Edison socket and base in energy efficient lighting fixtures.

What does Gu mean in light bulbs?

G: Globe, incandescent. GU: (GU/10), general use halogen indoor flood (third photo below from left, leftmost bulb of the pair, 12-Volts)